3 Ways to Determine the Age of a Baby Deer

Determining the age of a baby deer, also known as a fawn, can be crucial for their well-being and conservation efforts. Fawns are particularly vulnerable during their early stages of life, and understanding their age can help wildlife professionals and caregivers provide the appropriate care and protection. By observing their physical characteristics, behavior, and the time of year, you can estimate the age of a fawn with reasonable accuracy.

Within the first few hours of birth, fawns are typically covered in spots or blotches that help them camouflage themselves from predators. These spots gradually fade over the first few months of life. Additionally, the size of the fawn can provide an indication of its age. Newborn fawns are typically around 12 to 15 inches tall at the shoulder and weigh between 5 and 8 pounds. As they grow older, they will become larger and heavier.

The behavior of a fawn can also indicate its age. Young fawns are often unsteady on their feet and may struggle to walk or run. They are also more likely to stay close to their mother for protection. As they grow older, they become more independent and will start to explore their surroundings more. The time of year can also provide insights into the age of a fawn. Fawns are typically born in the spring or early summer, so their age can be estimated based on the season. By considering these factors in combination, you can determine the approximate age of a fawn and provide the appropriate care and support.

Weight and Size

The weight and size of a baby deer can vary depending on the species and age. Generally, male deer (bucks) are larger than female deer (does).

The following table provides approximate weight and size ranges for different stages of a baby deer’s development:

Age	Weight (lbs)	Size (inches)
Newborn	6-12	20-24
1-3 weeks	12-18	24-30
4-6 weeks	18-24	30-36
7-9 weeks	24-30	36-42
10-12 weeks	30-36	42-48
13-15 weeks	36-42	48-54
16-18 weeks	42-48	54-60

It’s important to remember that these are just general guidelines. Your baby deer should be weighed and measured by a veterinarian to determine if they are within a healthy weight range.

Behavior and Activity Levels

0-3 Weeks

Neonatal fawns are highly vulnerable and spend most of their time sleeping, concealed in vegetation. They can only walk for short distances and require frequent feedings from their mother. They typically stay motionless when approached by humans or predators, relying on their camouflage for protection.

3-8 Weeks

As fawns gain strength, they become more active and spend more time exploring their surroundings. They start to interact with other fawns and begin playing. By six weeks, they are able to run and jump. They still require regular feedings from their mother but can also start nibbling on vegetation. They remain cautious and will hide if threatened.

8-12 Weeks

Fawns become increasingly independent during this period. They spend less time with their mother and more time foraging for food. They have developed their motor skills and can run, jump, and climb with ease. They are also more social and form small groups with other fawns of a similar age. While still wary of humans and predators, they are less likely to freeze in place and may flee if threatened.

Tooth Development

Baby deer’s teeth erupt in a specific sequence that can help you estimate their age. Here’s a detailed breakdown of their dental development:

Lower Incisors

The first teeth to erupt are the lower incisors, appearing between 10 and 14 days of age. These four small teeth are located at the front of the lower jaw.

Upper Incisors

Next, the upper incisors emerge, usually between 20 and 28 days old. These four teeth are slightly larger than the lower incisors and are situated at the front of the upper jaw.

Lower Canines

The lower canines typically appear between 40 and 70 days of age. These two large, pointed teeth are located behind the incisors on the lower jaw.

Upper Canines

The final teeth to erupt are the upper canines, which usually appear between 60 and 90 days old. These two teeth are even larger than the lower canines and are situated behind the upper incisors.

Age	Erupted Teeth
10-14 days	Lower incisors
20-28 days	Upper incisors
40-70 days	Lower canines
60-90 days	Upper canines

Facial Features

The facial features of a baby deer can provide clues about its age. Newborn fawns have large, dark eyes with prominent lower eyelids that give them a “doe-eyed” appearance. As they grow, their eyes become more elongated and their lower eyelids become less noticeable. The ears of a fawn are also relatively large at birth, but they gradually shrink in proportion to the rest of their head as they mature.

Another distinctive feature of baby deer is their lack of antlers. Male fawns typically begin to grow antlers around the age of 1 year, while female fawns rarely develop them at all. The antlers of a young deer are small and velvety at first, and they gradually harden and grow longer as the deer matures.

Antlers

The size and shape of a deer’s antlers can also indicate its age. Yearling bucks (1-year-old males) typically have small, forked antlers with two or three points on each side. As deer mature, their antlers grow larger and more complex, with more points and a wider spread. Mature bucks often have 10 or more points on each antler.

The following table summarizes the typical antler development of male deer:

Age	Antler Characteristics
1 year	Small, forked antlers with 2-3 points on each side
2 years	Larger, forked antlers with 4-5 points on each side
3 years	Still larger, forked antlers with 6-7 points on each side
4+ years	Large, complex antlers with 8+ points on each side

Antler Growth (Applicable to Male Deer)

Antlers are a distinctive characteristic of male deer, and their growth can provide clues to the animal’s age. Here’s how to interpret antler development in fawns and bucks:

Fawns (Born in Spring):

0-6 months: No antlers yet.
6-10 months: Develop small, cone-shaped “button” antlers.

Bucks (Mature Males):

1 year (Yearling): Single, straight antler with a single tine.
2 years: Forked antlers with two tines on each side.
3 years: 4-5 tines on each antler.
4 years: 6-7 tines on each antler.
5 years: 8-9 tines on each antler, antlers may start curving back.
6 years: 10-12 tines on each antler, antlers continue to grow larger.
7 years: 13-15 tines on each antler, antlers reach their peak size.
8 years and older: Antlers may start to decline in size and number of tines.

Antler Size and Shape Variations:

It’s important to note that antler growth can vary significantly depending on nutrition, genetics, and environmental factors. Additionally, some deer may never develop antlers while others may have abnormally large or misshapen antlers.

Observational Clues from the Mother

Observing the mother deer can provide valuable clues about the age of a baby deer. Here are key observations to consider:

Nursing and Behavior

Newborns: Nurse frequently (every 2-4 hours) and stay close to the mother for protection.
1-2 weeks: Begin to explore their surroundings while remaining within sight of the mother.
2-4 weeks: Start nursing less frequently and develop their own hiding spots.

Physical Appearance

Newborns: Have spots or stripes for camouflage, which will fade within 2-3 months.
1-2 weeks: Spots or stripes start to fade, and their fur becomes smoother.
2-4 weeks: Spots or stripes have mostly disappeared, and their fur is more adult-like.

Size and Weight

Newborns: Weigh around 5-8 pounds and are relatively small.
1-2 weeks: Gain weight rapidly and become more active.
2-4 weeks: Continue to grow and gain weight, becoming more independent.

Age	Weight Range (lbs)	Size Range (ft)	Nursing Frequency
Newborn	5-8	0.5-1	Every 2-4 hours
1-2 Weeks	8-12	1-1.5	Every 3-4 hours
2-4 Weeks	12-16	1.5-2	Twice a day

How To Tell How Old A Baby Deer Is

Determining the age of a baby deer can be challenging, but it’s possible to estimate their age based on certain physical characteristics and behaviors.

Newborn fawns are typically light brown or reddish in color, with white spots for camouflage. They have a long, thin body and weigh around 5-8 pounds. Newborn fawns are unable to stand or walk and spend most of their time lying down in hiding places.

As fawns grow older, their coats become darker and the spots fade. They also gain weight and become more mobile. By the time they are 2-3 weeks old, fawns can stand and walk, and they start to follow their mothers around. At this age, they weigh around 10-15 pounds.

By the time they are 1-2 months old, fawns have lost most of their spots and their coats have become a more uniform brown color. They are also fully mobile and can run and play. At this age, they weigh around 20-25 pounds.

After 2 months of age, it becomes more difficult to estimate the age of a fawn based on its physical characteristics. However, their behavior can provide some clues. Fawns that are still nursing are likely less than 6 months old. Fawns that are fully weaned and independent are likely at least 6 months old.