Week 16 Of Pregnancy

Your baby has grown substantially by the time you're 4 months pregnant. Your baby now weighs around four ounces and the arms and legs are moving from nervous system responses. Facial muscles develop; during an ultrasound you may see your baby make facial expressions and even hear its heartbeat. Along with your own weight gain, you may experience more sensitivity in your breasts and vagina. Learn more about what to expect in the 16th week of pregnancy with expert advice from Sharecare.