6 month growth spurt

Alexus

I breastfeed while at home and I pump while at work . I am currently on my menstrual cycle so my milk has did a dip and my baby he breast feed off of me but gets fussy because after 5 mins it’s like my milk slows down 😩 I gave him a 4 oz bottle because breast was slowing down but he got fussy once I took the bottle away because nothing was left is he going through a growth spurt ?? If so idk how I can keep up with this