A new born child has an XY pair of chromosomes. Will it be a baby boy or a baby girl?

The new born child will be a baby boy. The unfertilized egg has one X chromosome; the sperm either carries a X chromosome or a Y chromosome. If X of the sperm fertilizes with the egg the child born will be female (XX), and if Y of the sperm fertilizes with the egg the child born will be male (XY). Thus the new born child with an XY pair of chromosome will be a baby boy.