As mother and baby adjust to the baby being outside of the womb, continued close contact is be important for both. Ample skin-to-skin contact—in addition to breast-feeding—helps ease this transition. Still, each body needs time to recover. It takes about six weeks after delivery for a woman's blood- flow levels and uterus size to return to pre-pregnancy states.
A year to 16 months after conception, the baby is able to sit up unaided. By this time, the muscles to support the large weight of the head have developed. The body's other systems, which had started to emerge in the embryo so early developed, will continue to grow and strengthen as the baby begins to explore the world.