My DH and I did this tour about a month ago. We left our 4 children (ages 17 months - 8 years) with my brother and SIL. If your baby was still in the sleep all the time newborn phase, I would think it would be fine, but at 6 months, they are more active and vocal and alert. I would think it would be hard for you to focus and it would interrupt others as well. Everyone has a headset to hear what the tour guide is saying and to hear a lot of audio clips of Walt and other people. Some of those are awfully hard to hear in a normal tour even without a baby. I think it would be hard with a baby. It really is a long tour, and it wouldn't be super easy to meet baby's needs in such a small group situation. Even with my easiest going child, I think it would have been a challenge because it is so long and such a small group. I think kids are pretty welcome most places at DL, but when I paid so much money for the tour, if there was a baby along that was making it hard to hear, I would be bothered. And I feel like I am pretty understanding with 4 young kids. I will be curious what you find out from Disney about having to pay, etc. Keep us posted. If you do take baby along, best of luck! It is a good tour and i agree with PP that tears will be coming!