My wife is pregnet with twins and we went to the doctors today which is a high risk dr he wasn't there so we seen the lady that does the ultrasound and she told us that our baby b was right on schedule with her weight but or baby a was under weight really under about 7oz she said that because thier is one placinta baby b is geting all the nutrition and our baby a not getting what she needs so she wants us to see the dr as soon as possible so we are going to drive 60 miles to his other office because she says we can't wait until our next appointment which is in one week now I'm very worried and the appointment isnt for 2 more days is this a common problem with twins and is there any thing we can do to help her?