The phrase "Mom’s footprints! Where next?" is mostly okay but can be made clearer.
Let's look at it step by step:
- "Mom’s footprints!" – This means the footprints belong to Mom. This part is correct.
- "Where next?" – This is a short way of asking, "Where should we go next?" or "What is the next place?" This is also correct but very informal.
So, the phrase is understandable and grammatically okay, especially if you want it to be simple and fun for a child.
If you want it to be a little clearer, you could say:
- "Mom’s footprints! Where should we go next?"
- "Mom’s footprints! What’s next?"
But the original phrase is fine for a story or a game where you are following Mom’s footprints and wondering where they lead!