I don't think so. BUT if one of the 2 is an adult (not sure if that is over 16 or 18 where DWP is concerned), you can claim for them and they can claim for the child, as long as both are inreceipt of DLAand the adult does not earn more that £100 a week.
That's my understanding of it. I stand to be corrected.
I loose my CA when I go to college full time in Sep. Even tho obviously I'm still caring for my DD, ever so slightly OVER 35 hours a week! I dont get it. Its not like i'm going to be earning (exactly the opposite in fact, I'll end up £thousands in debt)