I think Matthew 18:10 gives insight into this question.  Jesus has just compared entrance into the kingdom of heaven to having the attitude of a child.  The child is standing in the middle of the crowd Jesus is teaching (see 18:2).  Then in verse 10, Jesus says: “See that you do not despise one of these little ones. For I tell you that in heaven their angels always see the face of my Father who is in heaven.”  Jesus’ statement clearly suggests that these children have angels.  We cannot conclude from Jesus’ statement that each child has an angel.  However, we can conclude that angels are watching out for children!  This should come as a great sense of relief for parents and remind them that God is indeed on their side as they raise their little ones.