4 months old

Kari
My baby will be 4 months in 16 days...
He's not on baby foods yet he's still just taking a bottle. He used to eat every 3 hours. Now he's pushing it to ever 4 hours. But sometimes even at the 4 hour mark he doesn't seem hungry... Do I need to push him to eat at the 4 hour mark or do you think he can last 5 hours? Or is he still too little??