Charlie's sleep from 3-4 1/2 months was so bad that we eventually sleep trained. But then it was great for the most part until we transitioned to a regular bed. It was off and on bad for a year after that from 2 - 3! That stage was the hardest!

Olive didn't sleep through the night until 16 months when we sleep trained. But since I was nursing and usually slept in her room, I somehow survived. It was hard at the time but it's already a blur now that it's behind us even though she was waking up at least 3 times a night!

Bedtime has been more of a battle since we transitioned her out of a crib at 2, but not as bad as Charlie (although we largely attribute him not being sleepy at bedtime due to not enough stimulation at daycare).

What was the hardest sleep age for your LO?