My boy turned a month today

He just recently started drinking 3 oz of breast milk or formula and been good for every 3 hours ...past couple days he doesn't last two hours and wants to eat again ... U think he going thru a growth spurt? Or should I give him more than 3 oz.... I really don't wanna get him back in habit of eating every less than two hours and want him to start lasting 3-4 hours since he getting bigger... What should I do or what u reconvened ladies