15 weeks development

Between 15 and 17 weeks, the four lobes of your cerebral cortex have developed (frontal, temporal, parietal, and occipital).  Though, they will continue to develop and undergo neurogenesis and create billions/trillions of connections (which will later be pruned back) during the rest of gestation and even after you’re born!

Your perfect face continues to mature: the nasal plugs disappear, fat deposits fill out your cute cheeks and your tooth development (from the tooth buds) begins. I really cannot wait to see your face!

Growth of the lining of the large airways is well underway with cilia (tiny hairs) appearing for the first time at 15 weeks.Cilia are tiny hair-like projections extending from the cells lining your airway. They serve to trap and move mucous and debris toward the throat. Cilia are an important defense against foreign material and some infections. And here’s a fun fact, mature cells lining the airways will have approximately 200 cilia each!

Lots of arm and leg waving going on this week – and let me tell you I feel it! There’s not much coordination to it all though, just lots of splashing about and then long sleeps just to recover. Oh man, you are so precious!!

The three small bones in your inner ear start forming this week, so you will be able to hear very soon! You’ll start with hearing my heartbeat (only fair since I love to listen to yours haha) and then you’ll start hearing my voice as I talk and screeech…errrr…sing. 🙂 Daddy and I talk to you a lot so listen for us!

Your legs are now longer than your arms and your head isn’t your biggest body part anymore! Let’s hope it stays that way. Please, oh please, have my head and not Daddy’s! 😉 

Your body is becoming longer and is not as flexed and curled up on itself.

And I love this one – This week, your scalp hair pattern also is forming. I wonder what color and kind of hair you will have.

Here are a few pictures of what you look like this week that I pulled from the internet:


And my favorite this week…

You’re growing so fast my precious little Costa Rican monkey! Tomorrow we go up another week…yay! Until then, party on and sleep well! I love you.

About Em

After the loss of our first pregnancy, we took a much needed vacation to Costa Rica to enjoy each other and clear our minds. Well, as luck would have it, we brought home much more than great memories and great tans...our own little Costa Rican souvenir. Here is our journey!
This entry was posted in Neural development, Pregnancy. Bookmark the permalink.

2 Responses to 15 weeks development

  1. Grandma Em says:

    … Party on indeed. This weekend I get to meet you Baby Em. Grandma is going to literally see you on Saturday. Looking forward to the event. Keep up the good work in there letting Mommy & Daddy know you are growing. Sleep tight and fully stretch when you are awake. We love you!

  2. Pingback: 15 Weeks and Happy Valentine’s Day! | A Sweet Souvenir

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