Fever

Mga momsh, my baby is 1month and 21days.. May lagnat po sya.. 37.1 temp nya tas naabot dn hanggang 37.8.. sino po nakaranas dito na nagkalagnat c baby, wala naman sya turok? Gano katagal bago mawala lagnat? 1day lng b dpt? Help po paanswee. TIA