I just switched my baby to formula and her pediactrician said she should be taking 6 to 8 oz of formula every 3 to 4 hours. My daughter is barely getting down 4oz, during the night she only takes 2oz before she falls asleep, but then will wake up much sooner to eat another 2oz. I dont want to force more food but it just doesnt seem like enough. I have her on Enfamil Enspire.