Congratulations...great news, hopefully more will show up.
I too had a BKK just give birth and thought NO babies...went to clean the breeder box out and saw movement out of the corner of my eye (now I had searched that box with a light and magnifier and found nothing)
seems I have a baby blue panda which may darken as it grows, but it was hiding right down inside the ADA granules....would have missed it if it didn't move.
Now its living on my IAL that is in the box, I can see it picking over the leaf for biofilm.
Keep those in your tank as the babies seem to love to snack on them more so than on baby shrimp food.
Keep the pictures coming as it grows.