How can i tell if my child is still dehydrated after surgery?

See below:: Signs of dehydration may include: sunken eyes decreased frequency of urination or dry diapers sunken soft spot on the front of the head in babies (called the fontanel) no tears when the child cries dry or sticky mucous membranes (the lining of the mouth or tongue) lethargy (less than normal activity) irritability (more crying, fussiness with inconsolability) acute weight loss.