From Longman Dictionary of Contemporary EnglishBabygroBa‧by‧gro /ˈbeɪbiɡrəʊ $ -ɡroʊ/ noun (plural Babygros) [countable] trademark British English DCCa piece of clothing for a baby, that covers their whole body
Examples from the Corpus
Babygro• Philip Voss overcomes some obstacles - including at one point being dressed in a Babygro - to chart the King's decline. 