Older kids

I have no family around me right now so when the baby's born my older two kids will be staying at the house with their dad.im worried because he's never taken care of them by himself and he's not the most involved father. I handle everything when it comes to the kids. Their 3 and 1 so I'm afraid that he's not going to wake up when they get up in the morning to feed them or know what they eat or anything for them. I feel like he'll act like he normaly does and they won't get the attention they need from him because he's too busy worrying about himself.