How soon can I start harness training my baby bird?

You can start harness training as soon as the feathers are mostly opened. This will be as early as 3 weeks old, depending on the species of bird, before your baby should be taking his first flight. 

1-2 weeks before his first flight he should be wearing his harness outside while following you through the yard learning to perch on everything that is suitable for landing on.  

 If your baby is used to the sights and sounds of outdoors before he starts flying he will naturally follow you (walk), just as he would follow his mom in the wild. If he is exposed to the outdoors early the baby will be raised properly to follow the flock, and once he starts flying will already have a good understanding about where he should and shouldn’t be.

As your baby goes in and outside the house they will be developing the idea of ‘object permanence’, which is basically the awareness that there is a place called home that I can go back to. 

Babies should always wear the Aviator outside, because you never know when he will take his first flight.

It is also never too late to harness train a pet bird. It just takes a little more time to teach an older bird new tricks.