Congratulations! Your second trimester just officially started at this week. Your baby continues to grow rapidly, and has now reached the size of a nectarine.

Perhaps the most fascinating milestone at week 14 is that your little resident can suck the thumb now! The development of your baby’s brain also allows the facial muscles to grimace, frown, and squint. Think of these as practice movements, which your baby will use when he or she grows into childhood!

Meanwhile, the digestive system is busy developing, too. The liver is beginning to produce bile while the spleen is beginning to produce red blood cells.