It might seem obvious, but here’s an invaluable piece of new-dad advice: Never ask an exhausted new mother, "What's for dinner?" Instead, try, "Hey, what can I fix you for supper?" Parenthood is more than a full-time job for the first few weeks, which means Mom's share of chores will pile up. So pick up the slack on dishes, laundry, dusting, thank-you notes — whatever needs doing, whenever you can.