my bro got married a year ago and already applied for i-30 she lives in pakistan but now she is pregnant what if baby born before she get her visa

The F-2A category for a lawful permanent resident sponsoring a spouse is current at the present time, and so there is a good chance that your sister-in-law will obtain her interview and immigrant visa before the baby is born. If the baby is born in Pakistan before your sister-in-law obtains the immigrant visa, actions to be done depend upon at what stage of the processing the case is in. If the approved petition is with the National Visa Center (halfway house between U.S.C.I.S. and the consulate in Islamabad), the baby can be added in the processing there. If the case has advanced from the National Visa Center to the embassy, the baby can be added there. If your sister-in-law already has the immigrant visa, she is allowed to bring the baby with her to the US on her first trip to this country. She would have to bring proof of the child's birth. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.