Present etiquette when I have DC and they don't

[SpacePug]

Me and my 3 best friends have done a £10 limit for each other at Christmas for the past few years and it works well. I have a toddler who's birthday is in December. I know that they love to get DS a birthday and Christmas present and have already asked for ideas or told me what they are getting which is lovely. My thoughts are, it seems unfair that I spend £10 on them when they are spending £10 on me plus maybe £10 on DS birthday same again for Christmas 2 weeks later. What do you think I should do? Tell them not to get me anything and get for my child instead if they want. Or my other idea is give an extra gift at Christmas that is from my DS (he turns 2 in Dec). I could bake shortbread maybe and get him to do the icing

I would say take the financial value out of the thoughts about this. You and your friends buy each other gifts because you care about each other and want to celebrate the occasion. Your friends buy your child a gift for the same reason. The amount spent doesn't need to add up.
I'm the one without kids in my circle, I buy small token gifts for the kids and expect nothing extra in return. Personally, I love to receive drawings and handmade cards back from them, but I know that's not to everyone's taste.
If the amount spent does worry you, why not say no presents from anyone, instead club together for a nice night out with the friends (maybe not this year... 😒) and birthday presents only for kids.