Starting new job?

I'm graduating in May, baby's due mid June and I have been offered a position at a school starting mid August. It will be my very first job so I'm just nervous starting my career with a newborn. Should I accept the job or maybe just doing subing for awhile? The hours are 8-3 which is nice but I'm sure will be longer my first year or two. But the frequent holidays and breaks are nice as well. Any advice? Thanks!