Advice - how often?

Hi just wanting a bit of advice, trying to lose a lot of weight. Doing a programme at the gym 3 times a week which I hope to increase to 4 as soon as my baby feels like sleeping. Should I exercise at home the other days or should I rest. I am a busy mum who also does an active job on an evening so when I say rest will still be active but no planned exercise. Just confused whether a rest is needed or better to do exercise every day? Thanks in advance.