乳名

rǔmíng
infant name; pet name for a child

CEDICT

childhood name

Wiktionary

儿时的名字。

重編國語辭典

Entry Composition

1 乳 rǔ
  1. (bound form) breast
  2. (bound form) milk
  3. (bound form) newborn; suckling
2 名 míng
  1. name
  2. noun (part of speech)
  3. place (e.g. among winners)
  4. famous
  5. classifier for people