I'm pretty sure there's a Bonjela or something like that for babies Lucy. I'll have a look, see what I can find out for you.
Mind you, having said that, lots of things are packaged up for children of a certain age and yet in hospital we just calculate according to age and weight. For instance, Calpol (paracetamol) comes in two strengths 120 in 5ml and 250 in 5ml - we use either and calculate the dose
Glad you've got a nice dentist at least it does help if they're nice.