A noun appearing as N. lhaes “babe” in The Etymologies of the 1930s derived from the root ᴹ√LAP (Ety/KEM).
Neo-Sindarin: This word is sometimes adapted to Neo-Sindarin as ᴺS. laes, for example in HSD (HSD). This updated form is the usual revision of the voiceless initial lh of Noldorin to voiced l in Sindarin. However, this is not the only phonological difficulty in this word. For example, there is some evidence that in Sindarin, the vocalization of spirantalized p is to u rather than i, suggesting ᴺS. ✱laus. There is also evidence that voiceless stops didn’t vocalize before s in Sindarin, but rather became simple spirants, as in ach “neck” < aks, suggesting instead ✱laph. In this case, I think it is best to avoid all these complexities and just use the 1968 word S. gwinig for “baby”.
lapsë noun "babe" (LAP)