Still waiting on

Veronica • George Alek Jr 4/08/17💙 Layla Jae 8/16/2018💜 Currently pregnant due in November
My son's doctor to call back. My baby 1month old and I know the increase in the oz go up but now he only sleeps 4 hours at most a day and those hours aren't back to back it's an hour here an hour there..i want to make sure the formula he's taking (similac sensitive)is enough. I just want him to rest more😕