4am-6am wakings

Hi! I have a 9 week old and goes to bed 7pm, sleeps 4-5hr the first stretch and 2-3hrs the second one, after that he wakes up around 4am and has trouble getting back to sleep or wakes up every 1hr-45min until 6am, this has been happening the last couple of weeks and it is really draining. Anybody else have