1st time mum to prem twins ds dd 11weeks corrected 4 dd 4Ib 4oz now 8Ib 9oz ds 2Ib 2oz now 5Ib 15oz both bf,docs seem to think ds should be heavier and want to introduce a high cal formula not sure as wot to do as ds seems happy and i am to and want to keep bf is his weight ok as im getting mixed up and worried with all these opions please help