Fetal Development in Second Trimester

Learn what exciting changes baby goes through in the second trimester.
ByErin Walters
Updated
Apr 2017
Hero Image
Photo: Michela Ravasio

In the second trimester (weeks 14 to 28), baby goes through major development, forming more detail and getting all of those brand new body parts into working order. The organs further develop and start functioning, getting ready for life in the outside world.

Baby also grows eyebrows, eyelashes and fingernails (aww!), and his or her wrinkly skin becomes covered with fine hair (called lanugo) and a waxy protective coating (called vernix). In the second trimester, you’ll have the option of finding out baby’s gender, as the genitals develop and can be viewed during an ultrasound (usually at your 20 week appointment). You’ll start to feel baby too, as the little acrobat starts flipping and kicking around. In addition, by the end of the second trimester, baby will be able to swallow, hear, pee and suck his or her thumb.

Expert: American College of Obstetrics and Gynecologists. Your Pregnancy and Birth. 4th ed. Washington, DC: ACOG; 2005.

Related Video

Watch How Your Organs Make Room for Baby

Anisa Arsenault
Associate Editor
Published
02/24/2017

Why Your Baby Is Really Kicking in the Womb, According to New Research

Stephanie Grassullo
Associate Editor
Published
11/30/2018

New Study Confirms Newborns Are Super Smart

Ashley Edwards Walker
Contributing Writer
Published
12/13/2017

Study: Industrial Chemicals Pass From Mother to Fetus Throughout Pregnancy

Stephanie Grassullo
Associate Editor
Published
01/31/2019

This Common Pregnancy Condition Could Up Baby’s Risk of Autism or ADHD

Ashley Edwards Walker
Contributing Writer
Published
09/23/2019