Opinions/ advice ?

Mari
My son is about to be 2 months old on Monday. He's almost 14 pounds and I'm worried upping his ounces will make him overweight. Am I overthinking this ? I'm looking to start giving him 5-6 ounces. He eats every 2-3 hours. 
Just curious to know how many mommies feed their babies room temp or always warm the bottle ?