I am by no means an expert on baby sleep, but the (very) general sleep pattern that my girls seemed to have followed is:

• 0 to 2 months old: sleeps most of the day, but also wakes up often. She is still getting used to being outside of the womb.
• 2 to 4 months old: the sleepy newborn stage. She is finally used to the outside world and is “resting” from the trauma of birth. (Did you know that oftentimes, being born is much more difficult than giving birth? Think about how traumatizing it must be for the little guys!)
• 4 months onward: sleep goes to crap again, otherwise known as the 4-month sleep regression. She is starting to discover the world and is simply overwhelmed.

We sleep-trained Claire at 4.5 months because not only were we, as her parents, dead-tired and cranky, she was also miserable from the lack of sleep. Getting her from waking up 5-6x per night to 3x a night took about a week, and getting her to nap more than 20-30 minutes at a time took about two months. I used Dr. Weissbluth’s extinction method in both cases, and while sleep-training was one of the toughest things I did as a parent, I also believe that it was also one of the most worthwhile — Claire is such a happier child when she is well-rested!

With Aerin being a more laid-back, happier baby who slept better than Claire from the get-go, we had been hoping that we wouldn’t need to sleep-train her. And as she neared 4 months of age, I kept my fingers crossed that she would skip the dreaded 4-month sleep regression (as some babies do)…

But no such luck. Aerin’s sleep regression hit a couple of weeks before she turned 4 months old, and it progressively got worse. At one point, she was waking up every hour! She also seemed to have the same trouble that Claire had with naps, waking up just 20-30 minutes into her nap just as the deeper, more restful sleep cycle begins.