babies weight at 31 weeks?

Have our growth scan for our babies today, 31weeks +3, and a little nervous to see how they are growing, they have been good up to this point but still a little nerve racking, our last growth scan was 5 weeks ago!  They were 2lbs 3oz and 2lbs 2oz, 54% percentile and 44% percentile.  I am carrying my wife's babies (reciprocal ivf) and she was a tiny baby, born at 42 weeks and weighed 6lbs 11oz, I don't want tiny babies... what were your babies weights around 31 weeks?