Just be aware that with new child passports the requirements for documents are alot more than they used to be, this is what they are now -
If the child was born or adopted in the UK we need to see:
the childs full birth or adoption certificate showing parents details and evidence of one parents nationality or immigration status at the time of the childs birth. That is, either:
the mothers UK birth certificate, Home Office certificate of registration or naturalisation, or her passport that was valid at the time of the childs birth;
or the fathers UK birth certificate, Home Office certificate of registration or naturalisation, or his passport that was valid at the time of the childs birth and the parents marriage certificate.
Hope you can get hold of these documents easily.
Claire