Once upon a child worth it?

I have twins and have most of their stuff since birth and they are currently 2. I'm wondering if it would be worth it to sell the to once upon a child. Almost all the clothes are close to new, no stains or wear. I don't expect full price obviously but I also wonder if it's better to

sell them on FB. I plan to use the money and buy new clothes for them for summer and such. My husband is against clothes already worn so I don't do clothing swaps. I also have walkers, swings, pack and play, play pen.. all still in like new condition. We don't know anyone expecting and we are done with kids, I just want to get them gone.

So in your opinion would it be a loss if I did once upon a child?