he is not my spouse. i looked at that post already.
But advice is not very clear.
any guidance available in order to fill the form.

Hi, I am a mother of 6 months old baby born in Pakistan. At the time of birth, i was british citizen for nearly 4 years (which I got it through naturalisation). I am also a resident of UK but I opted for birth in Pakistan as my parents are over here. Anyways, I am filling the form on the behalf of ...