Sleep Regression

KS

Our 16 week old used to sleep linger stretches at night. He'd go down at 7pm and wake up between 2-4am for a feed.

This past week he has been waking every few hrs. Babbling to himself and wanting to play. I'm thinking it could be a sleep regression or teething.

How long does the sleep regression last? Any tips to help? Unless he starts crying I usually leave him and he settled back off after a while.