Your baby will roll around, swim, kick, and even experience hiccups. No need to fret: most babies have hiccups inside the uterus, a result of the spasms caused by an immature diaphragm. Your baby has been drinking up on amniotic fluid, training its digestive system for the feeding it’ll get in the future. Your baby also smiles, sucks on its thumb, and plays with the umbilical cord. Growth will start accelerating from now on.