Home moms & small kids? (Heidelberg)

Hallo everyone! We've just moved in Heidelberg 2 months ago from Finland. We have two small kids, 3 and 1,5 years old. 3 year old girl goes to gindergarten and me and the smaller boy stay at home daytime. Is here any other home moms who would like to have some company sometimes? :) We go to Pfitzenmeyer to do some sports, but really don't have any friends here yet...

Also, second question is that is here any activities for very small kids? Our 1,5 year old boy would love to do something more than stay home with me every day. :) Any swimming, playing, etc. courses near by? :)

Thanks,
Petra