Baby is 3 weeks old and I just started him on 3 oz of formula every 3-4 hours about a week ago. Today he was screaming and rooting and sucking at the air after his 3 oz so I thought hey I’ll try another oz why not. This boy is as happy as a honey bee right now. So my question is is there a 3 week growth spurt? Should I continue to give 3 then and extra oz if he seems fussy? Because sometimes I give him 3 oz and he’s perfectly content with only that and will fall right asleep.