Sleep regression?

Hi mommies. My sons will be 4 month in 1 week and since the beggening of may he wakes up around 3am and 5am each night (he use to do his night like 10 to 12hours straight of sleep since april 1st..) I tought it was a growth spurt because he was also fussy in the day. But now he's all happy ine the day. So when he wakes up I nurse him and I feel he's hungry, he doesnt nurse only for comfort... but I don't know if I should nurse him everytime he wakes up, if that will create a bad habit...

Please I need help. I dont know how to deal with it.