What Does a Baby Boy Look Like on Ultrasound?

Boy Ultrasound Gallery

1
Thirteen Week Boy Ultrasound

13 Week Ultrasound - It's a Boy!
It's a boy!. Photo © H. Whynot

The Boy Ultrasound Gallery is designed for you to see what a baby boy looks like on ultrasound photos from various weeks of pregnancy. Each week in pregnancy can look slightly different. This is because of a variety of factors including the weight of the mother, the position of the baby, the skill of the ultrasound technician, as some examples. You'll notice that what you see varies a lot by the number of weeks of gestation.

There aren't too many theories about what makes someone claim "It's a boy!" on ultrasound. Typically you will have the ultrasound technician looking for a penis or scrotum. Sometimes there can be an issue with the umbilical cord being in the way. Let's just start at the beginning and take a look at some of the photos of boy ultrasounds. 

Early ultrasounds look for something very different. A penis and clitoris look very similar in the early stages of pregnancy. The person performing your ultrasound will look for the genital tubercle. 

2
Fourteen Week Boy Ultrasound

Fourteen Week Boy Ultrasound

This is an ultrasound from week fourteen, barely out of the first trimester. It's actually really too early to tell if this is a clitoris or a penis, but the ultrasound tech is making a guess of boy. (It turned out to be correct.)

3
Sixteen Week - Boy Ultrasound

16 Week - Boy Ultrasound
Photo © Julie E.

 By sixteen weeks, you can see a more well defined penis.

4
Sixteen Week Boy Ultrasound

16 Week Ultrasound - It's a boy!
Photo © AG

The further along you are in pregnancy, the easier it is to get an accurate photo of the genitals. There are other details that are important as well. 

5
Sixteen Week Boy Ultrasound

16 Week Ultrasound - It's a boy!
Photo © J. Askins

After about fifteen weeks, the protrusion seen on ultrasound is more likely to indicate that you are looking at a boy via ultrasound.

6
Sixteen Week Boy Ultrasound

16 Week Boy Ultrasound
Photo © AG

As you can see, different angles from the ultrasound can also look very differently.

7
Seventeen Week Boy Ultrasound

17 Week Ultrasound Photo - It's a boy! - Ultrasound Photos
Photo © J. Rauch

Here you are look up from between the legs, the femur, or thigh bones, are visible on either side. The penis protrudes from between them.

8
Baby Boy at Eighteen Weeks

18 Week Boy Ultrasound - 4th Baby
The picture shows that baby is a boy. Photo © A. Coupland

The ultrasound picture is at eighteen weeks gestation. Another boy ultrasound photo taken from below the bottom.

9
Eighteen Week Boy Ultrasound

It's a boy! 18 Week Ultrasound
Photo © K. Harrell

 It is not uncommon to see an erect penis in boy ultrasound photos. This certainly makes it easier to distinguish.

10
Eighteen Week Boy Ultrasound

It's a boy! 18 Week Ultrasound
Photo © N. Wynne

The size and shape of the penis looks very different in each ultrasound photo. This is not necessarily that there is anything wrong but more to do with the gestational age and quality of the ultrasound.

11
Eighteen Week Boy Ultrasound

It's a boy! - Twin A - 18 Week Ultrasound
Photo © M. Horn

Here you can see the penis, but also part of the scrotum. 

12
Nineteen Week Boy Ultrasound

It's a boy! - 19 Weeks - 3d Ultrasound
Photo © K. Seraydarian

As three dimensional ultrasound became more popular, you were able to get a better image of the genitals to determine if you were having a girl or a boy.

13
Nineteen Weeks Boy Ultrasound

It's a boy! - 19 Week Ultrasound
Photo © C. Baker

 The scrotum is very apparent here in this photo.

14
Nineteen Weeks Boy Ultrasound

19 Week Ultrasound Boy
Photo © J. Yaist

The mid part of pregnancy, between eighteen and twenty weeks, is the ideal time to see the baby's genitals.

15
Twenty Week Boy Ultrasound

20 Week Detailed Ultrasound Boy
Photo © N. Hines

This is a great tutorial on boy ultrasound parts as the ultrasound tech labeled everything.

16
Twenty Week Boy Ultrasound

20 week boy ultrasound
Photo © K. Harrell

It's easier to catch the boys with the bottoms up view.

17
Twenty Week Boy Ultrasound

20 week boy ultrasound
Photo © L. Garber

The ultrasound tech gave a close up shot of the penis here to get a better view.

18
Twenty Week Boy Ultrasound

20 Week Ultrasound - Boy
Photo © C. Filipek

It's nice when you what a clear shot for viewing when figuring out if you're having a boy.

19
It's a boy! - Twenty Weeks

20 Week Ultrasound - Boy
Photo © C. FIlipek

 A very clear image of the penis in silhouette. 

20
It's a boy! - Twenty Weeks

20 Week Ultrasound - It's a boy!
Photo © C. Filipek

An erect penis at the midway point in pregnancy.

21
Twenty Week Boy Ultrasound

20 Week Ultrasound - It's a boy!
Photo © M. Hill

There are three little marks around the penis to indicate where it is located.

22
Twenty Week Boy Ultrasound

20 Week Ultrasound Boy
Photo © E. Pelechowicz

A clear view of the penis and scrotum from the bottom.

23
Twenty-One Week Boy Ultrasound

21 Week Ultrasound Boy
Photo © Sarah

Here you have the view of the entire baby and the erect penis.

24
Twenty-Three Weeks Pregnant - Ultrasound Pictures

This is an ultrasound from the twenty-third week of pregnancy. The penis is clearly defined and visible between the legs.

25
Twenty-Three Week Boy Ultrasound

 At twenty-three weeks into gestation you have a baby boy via ultrasound.

26
Twenty-Eight Week Boy Ultrasound

28 Week Boy Ultrasound
Photo © C. Bendickson

A clear view that they are having a boy.

27
Twenty-Eight Week Boy Ultrasound

28 Week Ultrasound Boy
Photo © T. Chandler

As the baby gets bigger, the structure of the penis and scrotum is more clear. But, as you can see in this image, it becomes crowded and where you once had a lot of space between the legs, now you have a lot of crowding. This can make identification harder.

28
Twenty-Eight Week Ultrasound Boy

This baby boy is 28 weeks along into pregnancy. The 3D ultrasound clearly shows the penis and scrotum.

29
Twenty-Eight Week Boy Ultrasound

28 Week Ultrasound - It's a boy!
Photo © Honey M.

You can see how the penis is now smaller in relation to the leg as the baby gets bigger.

30
Twenty-Nine Week Boy Ultrasound

It's a boy! - 29 Week Ultrasound
Photo © C. Rezek

This sideways shot gives you a good look at the penis and scrotum.

31
Thirty-Two Week Boy Ultrasound

32 Week Ultrasound It's a boy!
Photo © K. White

This is a shot of the testicles at thirty-two weeks gestation. You cannot see the penis here.

32
Thirty-Two Week Boy Ultrasound

It's a boy at 32 weeks!
Photo © T. Gipson

Another good scrotum image from the thirty-second week of pregnancy.

33
Thirty-Three Week Boy Ultrasound

33-week ultrasound of a baby boy.​

Thirty-three week ultrasound of a baby boy.​

34
Thirty-Four Week Ultrasound Boy

Baby Boy at 34 Weeks
Photo © K. Harrell

Here you can see the foreskin on the penis at week thirty-four in pregnancy.

35
Thirty-Seven Week Boy Ultrasound

Thirty Seven Week Boy Ultrasound

While more well defined, you can also see that at 37 weeks of pregnancy the penis is harder to see.

Source:

U.S. National Library of Medicine. Transvaginal ultrasound. Accessed 27 June 2017

Continue Reading