Month 1 – (first four weeks ) rapid cellular development

Month 2 – all vital organs are formed

Month 3 – kidneys are functional; fetus begins to swallow amniotic fluid; the sex is distinguishable

Month 4 – buds of permanent teeth appear

Month 5 – lanugo covers the body; quickening – mom begins to feel the baby moving

Month 6 – vernix caseosa (protective layer that covers the baby’s skin) appears; eyes open and close; baby responds to sound; baby has periods of sleep and activity; fingernails appear