Yes it stinks! And the poo has a very distinctive and quite horrific smell as well. The first two or three months on it and DH and I both wore nose plugs to change dirty nappies!!!!!
I did not notice it was thinner than other formula though?
But DS was still a bit of a spitter even when the MSPI was under control, it was not reflux or anything other than "baby spitting up" iyswim, but it was disgusting. I had loads of flannel baby sheets -- Canadian style ones, they are much better than muslins IMO as they are thicker and softer -- and I used to place one strategically to catch everything. Flannel (the material, not "a flannel" that you use to wash your face
) is nice because it is soft and it absorbs well, and yet is thick enough that the puke does not soak through if doubled. I suppose a nice soft bath towel could work as well.
But really, that was the best for me - nothing I could do to stop him from being sick, just had to manage where it landed!
How's he doing with taking it - have you mixed it or has he accepted it?