hello Nicole. I asked this question exactly a month ago. My LO at 11 weeks, decided to drink lesser or milk strike (60ml-120ml) all of a sudden. Got me worried also, I went to change the teat but it didn’t work.
Many replied me, saying that it’s probably growth spurt/leap. I also think it has to do with change in caregiver feeding her, previously my nanny used to feed her most of the time. But whatever it is, just ensure your LO is having 4-6 wet diapers, pooping well and gaining weight will do.
My LO is now 15 weeks, she is back at drinking 100-140ml every 3hrs. Before week 11, she was drinking 110ml every 2.5hrs. Don’t worry too much. Hope I’ve put you at ease somehow.