Monique's labour progressed at a rate of 1cm/hr. Twin A was in position LOA and station +2 when Monique began pushing. After 1 hr of pushing, Twin A was delivered spontaneously. He was vigorous at birth and weighed 2400 gm. An ARM and internal podalic version was performed to expedite delivery of the 2nd twin. Twin B was delivered 10 min after Twin A and was limp with no respiratory effort. After drying, warming, and stimulating Twin B, the pediatrician administered positive pressure ventilation for 30 sec. Twin B initially responded with improved color, tone, and respiratory effort. However, approximately 10 min after delivery, Twin B was showing signs of respiratory distress so he was transferred to the NICU for care. Twin B weighed 1900 gm. Twin A remains with Monique and Stephen in the birthing room. What was the weight of Twin A at birth?