Qenya
vinya
adjective. young, new
sinya
adjective. new, new, *current
vinye
noun. evening
nessa
adjective. young
sinye
noun. evening
tet(ta)
noun. baby
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A word in the Declension of Nouns of the early 1930s glossed “baby” with short and long variants tet and tetta (PE21/19).
Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. tyetl “a tiny baby” under the early root ᴱ√TYETE “give suck” (QL/50), a word that also appeared in the Poetic and Mythological Words of Eldarissa with the gloss “babe” (PME/50). This became ᴱQ. tetta “baby” in Early Qenya Word-lists of the 1920s (PE16/135), and finally tet/tetta in the Declension of Nouns of the early 1930s as noted above. There are no signs of this word thereafter.