Fussy baby especially during feeding, more alert, sleep poorly

My 1 month old plus baby (week 6) is suddenly crying a lot more than usual especially during (bottle) feeding ebm and drinks less than the usual 90ml. It’s challenging to feed him. Teat size seems ok - using hegen slow flow but make take at least 30min to drink finish and sometimes falls asleep midway. Other than that, he seems very alert these days. Is this his first leap? He is seemingly fussier the past few days. #1stimemom #breasfeedingmom