My tribe has grown to 35, when I try to have more babies it says I do not have enough housing. I have already built the second house are there more that I can't find?

Tinkerbell

There is one more hut (for housing) that you can build - but only after you have the right tech.

Time to get those scientists a'researching

Big population.

Just to your left (I believe) is a few rocks, that is your hut.

Best get you scientists to researchin'.

You should see the rocky foundations for the next hut. Drag a villager on to it and if the villager says they don't know how to build it you will need to get the next level of tech points.

Good luck !

It should be easy and quick to build though with lots of people, just put all your adults onto building and it'll be built in no time

Provided you've got a high enough level of tech!