Originally Posted by Tamino

Firstly, I would not stay near the airport. Take a taxi, 50€ or 55€ depending upon destination, into Paris and stay there.

Secondly, it is almost impossible to make any useful hotel recommendation without your giving a budget window in euros. Staying farther out will not necessarily save you money.

Lastly, hotels in Paris are very fussy about your reserving with an exact head count. It would be a mistake to assume a hotel would allow you to check-in with a toddler unless he was included in your reservation. It´s best to always state that you are a couple with a 1½ year old child, just as you have done here in your question.