I am definitely a 'she'. And very happy to hear of your success. 50 is a good number of fry, you may lose some as time goes on. I hope you have lots of neighborhood children who will love their bettas.

Its very ingenious for you to use a syringe on airline tubing as a siphon. I always just sucked on the end to get the water flowing.

You should be able to start feeding newly hatched artemia for feedings. To begin with you have been feeding mostly the infusoria in your tank. That gives the fry something to eat. Artemia are very tiny, its easy to overfeed. Those who are not eaten will fall to the bottom of the tank after a few minutes. So siphon the bottom of the tank after each feeding so the water doesn't become fowled. Just remember, in the beginning the fry can eat only newly hatched artemia, which is why you want to keep two hatcheries going. Some advise starting the hatching one day apart and just keep alternating the hatching in your hatcheries.

Please continue to keep us posted about your progress, and about your new baby when he/she arrives.