It also depends on whether you are feeding formula or br-east
milk.
There was major discussions about that. Br-east milk is thinner and
easier to digest, so the child gets hungrier easier.
Formula is thicker and it takes a longer time to break down and
digested. Thus you can have your child sleep longer to digest. But
there was other mothers who argued against it, cos the baby's
stomach might not get to digest the harder formula resulting in
gassy stomach and other aliments.
Colicky babies being one of the explaination.