3 month growth spurt?

My lo (12 weeks) has been in a good routine of eating, playing and sleeping - and will sleep up to 8 hours a night. The last couple of days though he has been feeding pretty much every hour or so, sometimes for as long as an hour, day and night! I feel exhausted and have sore nipples again. Feels just like the early days. I'm hoping this is just a growth spurt and we'll eventually get back to how we were before. Anyone else experienced this? If so, how long does it last?



Thanks



Mxx