Migrants behind the fence of a makeshift U.S. detention center in El Paso on Wednesday. (photo: Sergio Flores/Washington Post) On an average day under Trump, ICE has 25 children aged 3 or younger in custody. In total, at least 500 babies and toddlers have been detained. In the first years after birth, the human brain develops at a remarkable pace. Every second, more than a million new neural connections spring into being, shaping a person’s physical and emotional health for the rest of their life.