Baby’s sense of touch is critical to their first interactions with the outside world, and it begins developing early on. As early as 8 weeks of pregnancy, babies have sensation on their lips and nose. From there on out, baby’s sense of touch expands to other body parts as they learn to swallow, kick, punch and otherwise explore their tiny world. For most of pregnancy, this is a purely joyful experience: Research suggests that the nervous system isn’t developed enough for babies to experience pain until at least week 24 or 25 of pregnancy.