A nice small one is the soft play inside Dobbies garden centre. We love it there. £3 per child. And the best thing is you can see well from the tables so can enjoy a coffee and cake while the little ones play 😊
Belles play barn. It’s at the bell plantation garden centre in Towcester but it’s perfect size for that age! I take my 2.5 year old all the time 😊
Riverside Hub, on the pricer side but definitely worth it
About a 30 minute drive away if you have a car, but Titches Playroom in Daventry is definitely worth a visit!