4 month sleep regression happening early?

[Laur2017]

My DS is almost 13 weeks old and up until this week was sleeping quite well at night, up to 7 hours in a row. However, this past week he has only been sleeping up to 4 hours then waking regularly waking every hour or 20 mins and needs settling again! He's also starting his days at about 5am, whereas before that it was between 6/7! Is there any way to get him to sleep longer in the morning? Just wondering if this could be the 4 month sleep regression hitting early? Or just a growth spurt? Also he's EBF! Any advice please!
Thank you in advance :)

Could well be a growth spurt, there’s one around 3 months.

Have you got the Wonder Weeks App OP? That usually tells you when things are about to change

It’s been a while since mine were babies but I remember the No Cry Sleep Solution has some advice on early mornings. Other things to check for are making sure LO is warm enough as the nights are suddenly getting cooler, teething and getting plenty of feeds in during the day.

Mine is 15 weeks now and at 13 weeks woke up at 5am for four days in a row. We thought it was the new way of things, were trying to resign ourselves, etc. - but then he just went back to waking up at 7.30. This week he had two nights of 4+ wake-ups and I thought ah, the four month sleep regression is here - but last night he only woke up once. Obviously we'll have to see what he does tonight - I think he maybe has had a growth spurt (he's feeding a lot in the day too) but also I keep trying to remind myself that steps backward with sleep can just be very temporary blips!

My DS is 19 weeks old tomorrow and has been waking during the night since he was about 13 weeks old.
He used to sleep through and suddenly stopped. I have been feeding him now when he wakes during the night which is usually twice just so I can get a few hours sleep. Sometimes after I put him down he will wake multiple times - like tonight he's woken up about 4 times since he went to bed! He will usually sleep 6/7/8 hours when I put him down which is about 7pm and after that first wake up he can be hard work to sleep for long as he's had his 'stretch of sleep'.
I thoroughly believe there isn't a 'guide' or a 'book' for babies, they are all different and some of us are just unlucky if our babies do not like to sleep 
I have waited for 6 weeks to see if he will sleep through and he hasn't yet and I've researched so much on growth spurts and sleep regression and still hoping one day he will resume sleeping through.
Just know you are not alone and there are other Mumma's out there going through the same. Hang in there!
Maybe try offering him a feed when he wakes to eliminate it.
I keep telling myself they're not babies forever and try to embrace the sleepy cuddles during the night (even though sometimes I'm far too exhausted to!).
Do what works for you. I think a main part is to not let them get OT but hey, I've tried that and he still wakes!
Good luck x