蚕児 is read as さんじ (sanji) and means silkworm.
さんじ
sanji
かいこ
silkworm (Bombyx mori)
さんし
silk thread
さんぎょうぎじゅつけんきゅうじょ
Institute of Sericulture
さんししけんじょ
silk experiment station
こじ
orphan
いじ
abandoned child
みじゅくじ
premature baby
たいじ
fetus
したいふじゆうじ
physically disabled child
じしいじ
child who has survived the suicide of a parent
こうつういじ
child orphaned from a traffic accident
ちてきしょうがいじ
intellectually disabled child