I don't see that any re-tag is needed, in fact if you look at the full tag definitions you'll see they do cover exactly what you're talking about:
This age specific tag covers questions about kids after they start toddling around on 2 feet, but before you start working on school skills with them, so say from about 2 years of age to about 3 years. As with any age specific tag, the edges are fuzzy between this and the previous and following tags: infant and pre-schooler. A rule of thumb: if they are seriously mobile, it's time to move into this tag from infant, and when they start to develop social skills appropriate for school then you're ready to move up to pre-schooler.
This age specific tag covers questions about infants after they realize there's more to the world than eating, sleeping and filling a diaper, but before they start toddling around on 2 feet, so say from about 3 months of age to about 2 years. As with any age specific tag, the edges are fuzzy between this and the following tag: toddler. A rule of thumb: this time frame ends roughly when they become seriously mobile.
So it sounds like you want to do two things:
- adjust the age guideline between the two downward from 24 months
- change the summary to talk about the developmental steps instead of the age range
I'm ok with half of #1. The current age ranges were not meant to imply hard cut offs, but rather the wide range of possible options, there probably should be MORE overlap than they currently have. While kids can start walking as early as a year, many don't... so we shouldn't cut off infant at a year, by 2 years, the vast majority of kids have started walking... so that still seems a good end of that tag. But since many start earlier, the toddler should certainly start sooner.
If you're going to tackle the summary, I'd ask that you add developmental steps to all of them instead of just these two so that the summaries stay consistent.