Pearl,
Strictly looking at the weight, if the b.wt. was 6 -2 and the now wt is 8 -8
at 6 wks, that is gain of 2 - 6 or 38 ounces in 6 wks = 5.3 ounces per wk
which is within the 4-7 oz per wk we want (or 18 to 30 gm per day).  The 4
bms are good.  Of course you will look at the whole situation and see if
could be improved, but I don't think the pedi should have a snit over the wt.
Laurie Wheeler