婴 ⇒

• 女         nǚ/rǔ, female/woman/daughter, archaic variant of 汝[rǔ]
• 贝         Bèi/bèi, [貝], surname Bei, cowrie/shellfish/currency (archaic)
  • 人         rén, man/person/people/CL:個|个[gè],位[wèi]
  • 冂         jiōng, radical in Chinese characters (Kangxi radical 13), occurring in 用, 同, 网 etc/see ...

孩 ⇒

• 亥         hài, 12th earthly branch: 9-11 p.m., 10th solar month (7th November-6th December), ye...
  • 人         rén, man/person/people/CL:個|个[gè],位[wèi]
  • 亠         tóu, "lid" radical in Chinese characters (Kangxi radical 8)
  • ?         
• 孑         jié, all alone

婴 ⇒

• 樱        yīng, [櫻], cherry
• 鹦        yīng, [鸚], parrot
• 嘤        yīng, [嚶], calling of birds
• 缨        yīng, [纓], tassel/sth shaped like a tassel (e.g. a leaf etc)/ribbon
• 瘿        yǐng, [癭], goiter/knob on tree
• 撄        yīng, [攖], oppose/to attack
• 璎        yīng, [瓔], necklace

孩 ⇒

婴 ⇒
婴儿         yīngér, [嬰兒], infant/baby/CL:個|个[gè]/lead (Pb)
婴         yīng, [嬰], infant/baby
婴儿车         yīngérchē, [嬰兒車], baby carriage/pram/stroller
婴孩         yīnghái, [嬰孩], infant
弃婴         qìyīng, [棄嬰], to abandon an infant/abandoned baby
女婴         nǚyīng, [女嬰], female baby
男婴         nányīng, [男嬰], male baby
试管婴儿         shìguǎnyīngér, [試管嬰兒], test tube baby
育婴         
圣婴         ShèngYīng, [聖嬰], El Niño (meteorology)/Holy Infant (cf biblical nativity story)
婴幼儿         yīngyòuér, [嬰幼兒], baby
婴儿期         yīngérqī, [嬰兒期], infancy
母婴         

孩 ⇒
孩子         háizi, child
女孩         nǚhái, girl/lass
男孩         nánhái, boy/CL:個|个[gè]
小孩         xiǎohái, child/CL:個|个[gè]
女孩子         nǚháizi, girl
孩儿         háiér, [孩兒], child
小孩子         xiǎoháizi, child
男孩子         nánháizi, boy
孩         hái, child
孩子气         háiziqì, [孩子氣], boyish/childish
孩童         háitóng, child
毛孩         
孩提         háití, (literary) infant/young child
婴孩         yīnghái, [嬰孩], infant
毛孩子         máoháizi, (coll.) infant/ignorant child
狼孩         lánghái, wolf child/human child raised by wolves (in legends)
孩子家         
孩子头         
孩子王