Where does “dzieciątyszko” come from?

dzieciątyszko (Polish) comes from Polish dzieciątko, from Polish -ko, from Old Polish -ko, from Proto-Slavic -ъko.

Ancestry of “dzieciątyszko”, step by step

StepLanguageWordMeaning
1Polishdzieciątko
2Polish-koDiminutive suffix for neuter nouns
3Old Polish-kodiminutive suffix for neuter nouns; may cause various vowel shifts
4Proto-Slavic-ъko
Every word from Proto-Slavic -ъkoEvery word from Polish -koEvery word from Old Polish -ko