so I'm going back to school

To become a vet assistant, and my son is 4 months old. He'll be a little over a year when I finish, and I'm afraid I'm going to miss so much of his life.. my husband is in the military, and I'm afraid our son will grow up always missing both parents.. I also want to have more children but I know how demanding a vet assistant is so I'm completely unsure when my husband and I can try again for another... any advice 😭😭