Baby weight percentile drops

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Would you be concerned in my situation? My little girl was born 2 weeks late and was in 98 percentile for everything. At her 8 week check she was down to 60 percentile for weight but height and head were still 98 centile. Now at 3 months her weight is at 50 percentile but again everything else has stayed high. Should I speak to a doctor about it? She has her next vaccinations on Monday so I'm going to ask the nurse then.