What is the best baby betta fish food?

So I've been taking care of my female and male Betta .. feeding them frozen brine shrimp.. keeping the water warm and after I specially introduced them a couple times, it was sooo sweet... she would swim up to him, and he was soo gentle with her.. And I know I have at least 12 eggs in the bubble nest...I took her out because she was starting to look a little rugged.. The baby fry will feed on their yolks for the first 2 days, i know.. but """"""What is the best food for my fry?""""" I have pond water prepared... I have a dropper.. I have newly hatched brine.. Should I order vinegar eels? I just want healthy babies ... I would appreciate as much advice as I can get.. thank you!