It's really up to you, but here's a quick reference!
When pricing, the main thing to ask yourself is, "What would I pay for this?" It's always a good idea to try to stay competitive with the other items on the rack. Baby clothing, especially, will be more abundant than anything else so keep that in mind when setting your prices. Someone might pass over your super cute item if it's a tad overpriced and there's a comparable one right next to it.