O has been on first stage milk for about 7 weeks now. Over the last fortnight he's been getting hungry earlier & earlier. HV has always said that if he makes it to 3 hours between feeds she's happy but 2 & a half hours between feeds is becoming a regular occurrence. I bought a box of hungry milk & tried him with it. I've noticed that on it he can go 4 hours between feeds. Is this an indication that I should maybe move him to hungry milk permanently?