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CFA L1 here, but I have some experience in post-baby careers.
IMO what you’re trying to do might be a little unrealistic. I don’t see many people trying to break into IB after starting a family. 1. Switching careers to IB from a non-related field and 2. after maternity leave is a very very ambitious target.
Bluntly speaking, I think you may find that you may not be able to compete with grads for graduate jobs.
My advice is to stick to your current field (maybe move away from manufacturing to an industry closer to banking), build up your resume past the maternity break, then try IB again. But I’d look carefully at IB and consider if that’s what you really want at this stage of your life.