No matter how thrilled you are to meet this tiny critter, don’t be surprised if you’re also experiencing self-doubt and nervousness as the reality of the situation (parenthood, that is) sets in. That’s totally normal, so don’t expect to know how to do everything right away. The most important thing (loving your child) will come naturally and, in time, you’ll figure out the rest. What’s up with your baby’s development? Well, she’s displaying a wide range of newborn reflexes (some pretty strange, all very normal) and she might be temporarily funny-looking (i.e., puffy and/or pointy) after living in your cramped uterus for nine months, then squeezing through the birth canal. She may also drop some weight (about 5 to 10 percent of her birth weight due to normal postdelivery fluid loss) before she starts to gain. And while she may be very, very sleepy at first, she’ll soon be wide-awake (and not always when you want her to be). Your goal right now: Get a handle on breastfeeding or bottle feeding and take good care of yourself (adequate rest, nutrition, and hydration) so you’ll be at your best as you bond with your baby. Enjoy!

From: http://www.whattoexpect.com/first-year/month-by-month/week-1.aspx#