That will leave some with babies facing some tough decisions over childcare.
It is not a rule that sits well with boss Nigel Clough, who said: “Apparently it's a Wembley rule that they don't admit under-twos into the stadium, though I am not sure why that would be.
“Because we have an experienced squad I think we have 30-odd small children among the squad which is quite a lot.
“A few have recently had babies as well and this obviously causes parenting and childcare issues.
“When you have got to leave your baby at home maybe your wife might have to stay at home to look after them, so it does cause a problem.
“I can't understand the rule really.
“It is just a shame that the whole families can't go.”
Striker Jordan Bowery, while not affected himself, said: “When you want your whole family to be there it's a shame they can't be there and I don't know what the problem is.
“They are only going to sit there on someone's lap, not causing any issues. But it is what it is, we just have to get on with it.”