2 year old losing weight?

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DS is 28 months. At his 2 year check in Jan he was around 50th centile for weight (12.7kg) and 25th for height (85.5cm). I was a little surprised by this as he seems in proportion and his dad is just under 6ft (though I'm 5'2") and DD is fairly tall for her age. HV wasn't concerned though.

I just randomly weighed him on our digital scales as DD wanted to have a go, and he's apparently now dropped to 12.2kg! He's happy and seemingly healthy, very rarely sick. He eats fine - maybe not huge quantities but he's not especially picky and eats three meals a day plus snacks.

I'm obviously going to contact the HV tom but I'm quite concerned and can't think of any logical explanation that isn't scary. Can anyone reassure me?

Are your scales accurate? Was he standing still and the scales on level floor when you took the measurement? No harm in getting him professionally weighed though to put your mind at rest.

Are your scales properly calibrated?

He was standing pretty still and I did it a couple of times to double check, came out at 12.2kg each time. I've just spoken to DH and he thinks they may not be calibrated 100% correctly though and/or not as accurate at lower weights. He's normally the bigger worrier out of the two of us so hopefully it's just that! We're taking him to the GP on Friday anyway about an unrelated issue so could see if they can weigh him then.

It was only around 12kg that I got weights that matched my daughters weights measured in the hospital. She's more like 15kg now and they still can be off a little.
I've been weighed today and weighed the same in the hospital fully clothed with jeans on at lunchtime as I did the morning in just a t-shirt before eating/drinking anything!

I wouldn't worry about the weight/height different percentiles. My daughter is 2nd percentile height and 25th percentile weight and is totally in proportion - confirmed by her paediatrician, dietician and HV! She must just have very dense tissue! At one point she was 1st percentile height and 50th percentile weight and had a belly after eating but otherwise looked in proportion. I'm definitely happy now they've moved slightly closer together! Up to 2 percentile ranges different is classed as normal

I would definitely be monitoring the situation.

I remember when my dd had a two year check and consultants appointment within a week of each and she weighed 0.5kg less at the second one. I think scales can vary. Does he look or feel like he has lost weight?

Thanks all. I used the HV chat service today and the HV wasn't worried but had pointed me in the direction of some walk-in weighing sessions so I'll take him along and see how we get on.