What Your Baby Should Be Doing at 15 Weeks

Your 15 Week Old Baby


Baby Week 15

Remember every baby is different. Not only will your baby not be hitting the same milestones at the same time as other babies you know, but he won't look the same. Some babies are short with rolls. Others are long and lean. Neither of these possibilities determines if your baby will be heavy or skinny as an adult.

In reality, it doesn't matter how big your baby is now. Doctors commonly use a growth chart to keep track of your baby's growth. The chart is on a curve, and within a couple of months, your baby's curve will become apparent. When you visit the pediatrician he will update this chart. As long as your baby stays on the curve your doctor will probably tell you not to worry and that your baby is completely healthy.

Photo of 15 week old Brenna submitted by Babies Online member Tammie T.

FREE Disney Cakes & Sweets: Magical Recipes

Mickey Mouse cookie cutter & Winnie the Pooh cupcake stencils FREE!

Introducing a brand new Disney cake decorating & baking collection! Everything you need to create a little Disney magic!

  • Packed with delicious recipes
  • Easy-to-follow techniques
  • Helpful tips from cover to cover
  • FREE digital magazine edition
  • Comes with specifically designed baking tools to add to your Disney kit

Yours free! Just Pay Shipping & Handling
Order Now


Week 15 Milestones

At this point your baby might be able to razz, which is when they make a wet razzing noise. It is just another form of communication for your baby.

What Might Concern You at 15 Weeks

Baby Week 15

Has your baby found his thumb? Thumb sucking in infants and children is a common form of comfort and has been seen as early as in utero. At first you may think this is cute, but after a while you might start worrying about it being harmful to your baby.

At this stage it isn't dangerous for your baby to be sucking his thumb. He doesn't have his permanent teeth yet so he won't be hurting the shape or growth of his mouth. Most children out grow the habit relatively easily.

This Time Last Year...

You were 3 weeks pregnant. How did you imagine having a 15 week old baby would be then? Visit our Fun Birthday Facts Calculator for more trivia about your baby's birthday like what happened on that day in history, when your baby will be driving, and more!


Not a member? Join Babies Online Moms for the complete guide to Your Baby's First Year. Get access to member's only content, message boards, fun facts, and more! You will also receive free personalized emails that detail your baby's development week by week. Plus get FREE tips and special offers!

Enter your baby's birthday

Enter your email address

Privacy Policy & Terms of Use


Commonly Asked Questions

Babies Online Moms with 15 week old babies have commonly asked the following questions:

Of Special Interest


Free Baby Stuff

We know how expensive it is to have a new baby! That's why we've partnered with select companies to bring you free samples, coupons, and discounts from the names you trust. Get Your Free Baby Stuff Today

Get Free Huggies Samples and Coupons Get Free Enfamil Samples and Coupons Get Free Gerber Samples and Coupons Get Free Pampers Samples and Coupons
*Each child is different. Your baby may not progress the same as the information found here. The information here is based on the national average. It is not meant to be a replacement for any advice you may receive from your doctor. If you have any concerns about your baby, we advise you to contact your doctor.
BabiesOnline Member?

Sign In

Register Now for FREE!

Learn about your growing baby with our personalized weekly calendars, calculators, articles & information. ALL 100% FREE!

Enter baby's birth or due date:
Need our Due Date Calculator?

Connect with Us

Connect with us on Facebook
Tweet us on Twitter
Stumble Upon Babies Online     Babies Online RSS Feed