I worm my birds twice a year with Ivomex. Plus Ivomex is good to keep mites & lice off your birds.
Here is the website with instructions & some information.
http://shilala.homestead.com/ivomec.html
I don't worm mine until they are 6 months old and they are close to adult size. I don't know if babies would need wormed that soon. Maybe someone on here does and can help you out.