These are your child's BABY TEETH. Baby teeth will fall out before his permanent teeth come in. These teeth will be bigger. IT is good to have a little space in the front or bottom. That way when the bigger teeth come in (each at a different time in his childhood) they will not be crowded and crooked.
Look around at your friends and notice their teeth. Why are some straight and why some crooked, because of the space that was there in the beginning. (maybe also braces but all that is doing is pulling back teeth and respacing the other teeth to fit the mouth. I was once told by brace doctor,"Your son has a size "eight" mouth and size "ten" teeth!" Even with removing his back teeth and wearing braces his teeth returned to his crooked positions after the braces(not enough space).
Is there anything else about teeth from your past that might have you worried about this situtation? With or without spaced teeth I am sure your child is a marvel from God.