Awww women always feel guilty whatever choices we make.
I worked when my children were young and they all went to nurseries/ childminders at some point. I don't think it affected any of them negatively - they all have very different personalities but all of them loved going to childcare (tbh they did so much more there than I ever did with them!)
I think if you really want it you should go for it - a happy mummy makes for a happy child :-)
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