Weight loss plateau

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Hi everyone! I'm new to this website and was looking for some help. I just had my son in March and started losing weight as soon as I got the O.K. from my doc. I have gone down from 165lb in March to 128lb currently. I have been stuck in between 127 and 130 for almost a month now. I am doing everything the same and am not sure what to do to amp up my weight loss to reach my 115 goal. Any suggestions from people who have hit this plateau, moved past it and how long it took would be much appreciated!! Thanks :)