Winchester Hospital has an urgent care on route 62 in wilmington, went once for me... don't know how pedi friendly it is... you may be able to check on the web also Harvard Vanguard has an office in Chelmsford on 129 with weekend hours but don't think it is considered an ER..
Lawrence General has a pediatric after hours clinic in the ER-- we've been there for scheduled appts on late evenings or weekends when the pedi wasn't open and had good experiences and not much wait. They also see peds in their regular ER for true 911 emergencies. The after hours clinic is really an urgent care/can't wait for the am thing.
Re: Ped. ER/Urgent Care near Andover/Tewsbury?
DD1 7/10/08 DD2 8/11/10 DS 7/2/13