GOV.WALES uses cookies which are essential for the site to work. Non-essential cookies are also used to tailor and improve services. By continuing to use this site, you agree to our use of cookies.
You are here:
Noun, Feminine, Singular
cerrig milltir datblygiad
Ymddygiadau neu sgiliau corfforol a welir mewn plentyn wrth iddo dyfu a datblygu. Bydd y cerrig milltir yn wahanol i bob ystod oedran.