A detailed grammar correction and explanation for the sentence about soft toys, suited for a 26-year-old student
The original sentence: "Safe and nice to the touch, soft toys are a popular choice for the smallest ones." is grammatically correct, but it can be made clearer and smoother.
The phrase "safe and nice to the touch" is a good descriptive introduction, and "soft toys" is the subject. The latter part, "a popular choice for the smallest ones," correctly implies that soft toys are preferred for very young children.
If you want to improve the flow, you could write:
Either way, your original sentence is correct, but these options might sound a bit smoother and more formal.