This is rare in bottlefed babies. Your baby should be fed on demand and not at set times; demands may vary from day to day. If your child consistently seems fretful after he drains each bottle, he may well e hungry. Offer him an extra 2 fluid ounces (60 milliliters) of formula. If he takes it, then he needs it.
If your baby demands frequent feedings but doesn’t take much, the nipple hole may be too small, so that he is having difficulty sucking the formula and is tired before he gets enough.