New to this... Need some tips

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I'm currently 10st 12 5ft 2. Target weight 8st 4. After 1st baby went to 9st 10 very happy with that then pregnant again less than 2 years between them now 10st 12 little one is now 6 months!! Have brothers wedding in June. Very little time self employed, 2 kids and partners kid to look after. Any help, I seem to constantly graze as I'm always tired and never get to sit down and finish a meal...