New mum looking for friends

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Hi i am a new mum to a 3 week old boy and i have a 4 1/2 year old daughter who i run about after quite a lot for her activities and nursery runs.

I have done this previously a year or so ago and after putting on a good few pounds i am ready to get back into it. I am currently at my heaviest weight and would like to loose 40lbs.

Any adive would be most welcome and new friends would be greatly appriciated