Should I get normal size nuna sena baby playpen or mini nuna sena? I am worry if mini version is not as stable as the normal size. Please advise.

The mini nuna sena is a smaller version of the standard playpen, so I would think that there would be no difference in terms of stability. The standard playpen is quite heavy though (10kg). The mini can fit a child up to 18 months old, so I'd go for the mini and switch to a toddler bed after 18 months. https://www.youtube.com/watch?v=fzKsEo0vzNo