puppy fat
US /ˈpʌp.i ˌfæt/
UK /ˈpʌp.i ˌfæt/

1.
婴儿肥, 儿童脂肪
fat on a child's body that disappears as they get older
:
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She still has a bit of puppy fat, but she'll grow out of it.
她还有点婴儿肥,但长大后就会消失的。
•
Many children have puppy fat before they hit their growth spurt.
许多孩子在快速成长期之前都有婴儿肥。