My little cold frame Robins

A bit of a long story but suffice to say clearing out the cold frame at the weekend I nearly threw a tiny flowerpot out and just at the last moment realised it was crammed full of tiny robin babies!!!!!
I moved the nest to a bigger flowerpot and tried to rearrange things but all their green camaflauge had been disposed of. :(
And into the bargain the glass makes it unbearably hot for them.
So everyday I have to open it and put up barricades to try and stop the cats sneaking in and to make sure they don't overheat!
They are growing but I know they are incredibly vulnerable , but I can only do my best!!!