Normal thyroid level ranges for children

My daughter has been experiencing unusual weight gain for the past 2 years.  Her pediatrician thought it was due to her diet and lack of exercise.  Since then, we've monitored her diet closely and increased her exercise level but her weight is still climbing.  I had the doctor ordered some blood test since I have thyroid problems.   In 2008, when she was 4, her Free T4 was 1.0; T3 Total was 92; and TSH 1.12.  In 2009, her TSH was 2.8.  In 2010, her T4 (I assume is total T4) is 3.4 and TSH is 3.080.    It is odd that her 2010 results for TSH is normal and T4 is low.

And is there a reference table for normal ranges for Total T4, Free T4, Total T3, Free T3, and TSH for a 6 year-old girl?  The ranges that the lab provide are for adults.  Thanks.