Babies born prematurely or ‘pre-term’ (before 37 weeks of pregnancy) may have a higher risk of immediate or longer-term health problems.
Mae cyfran y babanod a gaiff eu geni cyn i’r beichiogrwydd gyrraedd 37 wythnos ar ei uchaf ymhlith y mamau ieuengaf a’r mamau 35 oed a hŷn.