A somewhat formal or literary term for a very young child. In everyday speech, 幼児 (ようじ) or 赤ちゃん (あかちゃん) are more common.
The facility provides childcare for young children.
Many old tales feature a young child as the main character.
Compound of 幼 (young) and 者 (person). The reading ようしゃ follows standard on'yomi patterns.