This is not true. According to this group, which supports adoption, https://adoptuskids.org/meet-the-children/children-in-foster-care/about-the-children ,
"According to the most recent federal data, there are currently more than 400,000 children in foster care in the United States. They range in age from infants to 21 years old (in some states). The average age of a child in foster care is more than 8 years old, and there are slightly more boys than girls.
Children and youth enter foster care because they have been abused, neglected, or abandoned by their parents or guardians. All of these children have experienced loss and some form of trauma."
They go on to say that more than 100,000 of those children are waiting to be adopted. Their chances get progressively worse as they get older, if they have disabilities or a history of trauma, and if they are children of color -- or boys. There are not enough families ready to offer a loving home to all of these deserving children, let alone a flood of new babies.