Baby born in UK to Tier 2 parents

[BJV]

Hi, My husband is working in the UK on a Tier 2 Visa and I have a dependant visa. We have a 6 month old baby born here in the UK who now holds an Australian passport. I need to go to Australia urgently and would like to know if I will have problems bringing her back into the UK? Will she need a visa to re-enter?
We have not added her as a dependant on theTier 2 visa as yet and I believe it's not compulsory so we thought we’d wait until(if) we complete an extension application(?)
I would really appreciate any guidance.
Thanks very much

[cfdman]

Your baby doesn't need a visa as long as he/she remains inside the UK, living with you. But, she/he is still subject to immigration controls, meaning that the conditions of your stay applies to him/her regarding the public funds etc.

However, if your baby leaves UK border and wants to re-enter later, he/she must apply for a dependent visa in the british high-commision abroad. In your case, you should file a dependent visa application in Australia. You should carry the full-birth certificate of your baby, and evidence of support/maintenance (bank statements of you/partner). Please note that the end of validity of the visa issued to your child will be the same as that you.