My daughter says NO for another baby

Me and my husband are planning for a baby(boy hopefully) but our major problem is our 2yo daughter, we keep on asking her if she wants "Ading" or "Baby bunso" but her answers always is "NO NO Ading Mommy" my child is so SELOSA in terms of borrowing my cousin's baby she doesn't want me to carry a baby. ?Don't know what to do, we badly want a baby boy but seems our daughter wants our attention ONLY to her.. I need help!!! Any advices will be much appreciated. thank you ?