one of the triplets was behind. We could not see her at the six week u/s. She was a surprize to find her at the 7 week u/s. She was smaller and hb was slower than the boys (who were right on track). The RE did not think she would make it but by the 10th weeks she had caught up. She is 16 months old now and doing great.
I know it scary but you just don't know. Praying that all goes well