Amar’e Stoudemire and his wife, Alexis Welch, who gave birth to a boy just a week ago, made a celebratory post-baby family outing Sunday to Merchants River House in Battery Park City. We’re told the couple were with their three other children, daughters Assata and Are, and son Amar’e Jr., but left the newborn at home. According to a spy, Alexis “was glowing.” The family dined on artichoke dip, fish and chips, pan pizzas and chicken tenders.