If your baby is sleeping through the night (five or six hours at a stretch), you're one of the lucky few. Most 10-week-old babies still wake up in the wee hours. But even babies who aren't sleeping through the night at this stage should be sleeping and staying awake for longer intervals rather than cycling back and forth so much. Your baby will probably have two to four long sleep periods and as many as ten hours of awake time in 24 hours.
An interesting note: Whether your baby is a night owl or a morning lark, a long sleeper or short sleeper, that pattern will probably stay the same throughout childhood.
Break out the bibs
Your baby's salivary glands have been working since he or she was in utero, but now you may notice the beginnings of drool. Drooling happens because your baby is putting everything in his or her mouth and producing more saliva than can be swallowed.
Drool doesn't mean that your baby's teething just yet, though – that probably won't happen for another two weeks, at least. The vast majority of babies sprout their first tooth between 4 and 7 months of age. If your baby's an early developer, you may see that first white cap, usually one of the bottom two middle teeth, as early as 3 months. (In rare cases, a baby's first tooth is visible at birth!)
Many parents add a bib to all their baby's outfits to catch the drool. If you do, remember to take the bib off when your baby sleeps to prevent strangulation.
The good news is that your baby's drool coats toys and other objects with disease-preventing proteins. That's fortunate, since your little one will continue to mouth anything within reach.
Turning over a new leaf
Your baby may be working on rolling over. At this age, your baby will probably be able to move from the side to the back, and the back to the side. The complete rollover won't come for another month or so, though, because your baby needs stronger neck and arm muscles for that maneuver.
Your baby's increasing mobility means that you have to be extra careful. Make sure to keep a hand on your baby during diaper changes and never leave your baby unattended on a bed or any other elevated surface.