Paris with toddlers

[Parietal]

i will have a 3 yr old and a 3 month old in Paris for a day while DH is in meetings. Any ideas for where to go or what to do?

Jardins du Luxembourg! Round abouts, open spaces and a fantastic playground (which you have to pay for, but still) They also do puppet shows. Maybe do a Batobus tour on the Seine first to fill a whole day.

People are telling me of a transport type museum at porte de la villette...

Thanks for the ideas. Any suggestions for if it rains?