I just started hand feeding my 3 week old Cockatiel chicks today. They're a little skeptical since it's their first time too. I'm using a syringe right now, and as per someone else's recommendation, I pre-filled all of my syringes, but of course as I'm feeding the first baby the rest of the syringes get cold. My question is how to keep the formula warm in between feeding different babies? After the first two chicks, the rest of the babies really didn't want to eat, and I'm assuming it's because it was cold. Is there a better way to feed the babies and keep the formula warm?