Xilligaas waalidka waxba looma sheegin, waxaana madaxa ka gayaalay dhaawac buuran oo qadaadka ah, dhawacaas oo waalidka loogumacneeyey markii danbe, in uu soo gaadhay xilli ay la tacaalayeen in ay ku xidhaan oxygen ay ka illaaween markii hore.
