Mrs Brisdion said: "It's wonderful news - it offers freedom".
The mother-of-twins, from Brockenhurst, started campaigning for better facilities seven years ago, when her children Erica and Hadley were three.
Mrs Brisdion said Hadley faced the indignity of having to lay on the floor when he became too heavy for baby changing facilities.
"It dominates what you can do and where you can go if you are constantly having to think about lying on a toilet floor to be changed or using the loo in the car... so you choose not to go out," she said.
"This opens up loads more opportunities for us and thousands of people - giving them options of places they haven't been able to go to before."
She added they were opportunities "many take for granted".
Hadley, who is now 10, said things were "certainly improving".
He added: "I remember when I used to have to lie on the floor and it's not very comfortable to say the least.
"It feels horrible, you're uncomfortable, you're lying down, you're trying to get changed, what are you supposed to do? No-one should have to do that."