How many letters does the top answer for “an infant that is born prior to 37 weeks of gestation” have?

The most common answer is preemie (7 letters).

Crossword clue: an infant that is born prior to 37 weeks of gestation

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

preemie 7 letters wn-def

an infant that is born prior to 37 weeks of gestation

premie 6 letters wn-def

an infant that is born prior to 37 weeks of gestation