What Size Is A Standard Bassinet Mattress?

What Size Is A Standard Bassinet Mattress? Fit. Traditional oval- or rectangular-shaped bassinets measure about 30 to 33 inches long by 15 to 18 inches wide. Why are bassinet mattresses so thin? Why Are Bassinet Mattresses So Thin This is because if the mattress is too thick and soft, an infant may sink their head