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I gave birth after he submitted his forms,they are 3 years old.is it ok?

Yes, that should be fine. They should qualify through the pilot.
 
Yes, that should be fine. They should qualify through the pilot.
Sorry for the repeated questions,I am about to submit my forms through one year window of opportunity provision, so should I add a letter of explanation about the undeclared children.thank you.
 
Sorry for the repeated questions,I am about to submit my forms through one year window of opportunity provision, so should I add a letter of explanation about the undeclared children.thank you.

I don't know the answer.