 As part of standard of care, patients will be weighed using either a single infant or pediatric scale located in triage at presentation to the Pediatric ED PED Time 0 age appropriate infant scale versus standing stadiometer in Triage. Infants will be weighed naked and older children in a hospital gown. Change in weight at discharge or follow up fu, compared to baseline is an adequate measure of dehydration that has been used standardly in studies of this nature. 