baby weight
Noun
Meaning
Bodyfat gained by a woman during pregnancy.
The weight of a baby at birth; birth weight.
Source: en.wiktionary.orgSynonyms
Examples
I find it to be strange that people get obsessed about how fast actresses and celebrities are taking off their baby weight. I guess people like to look to them and feel better about themselves or feel worse about themselves.
It's always when you think that you've lost a little of the baby weight that someone steps in grabs a handful of a now sans baby soft belly and asks the inevitable 'When are you due?'