It looks like someone combined the infant tag with children. I realise that we probably don't want tags for every age of child, but I'd think that the challenges for travelling with a baby are different from children that are able to walk and talk that it would be worth differentiating. Then again, I don't have the experience yet to know -- maybe the challenges are similar?
I would vote for separation, given diaper/feeding/nursing issues of babies on trains/planes vs travel with kids - definitely different issues. Prices also differ - infants are often free. Understand where you're coming from. Others may disagree though?
The tags and whether to keep separate or merge was discussed in the general tag issues thread but not many people bothered to comment on it at the time.
I was just "being bold" since the few votes seemed to think it was a good idea to lump them together but certainly feel free to discuss and change them. I think Dori did the original merging and then I added more to my answer later.
One problem might be where the family fits in if putting children of different ages in different tags?