WIC vs doctor

Why at my doctor office they said my son was 75th percentile in height, but at my WIC appointment they said 50th? Why are they different and which is more accurate?

My son is 6 1/2 months and doesn't fit 6-9 month clothes any more. He fits 9m perfectly and 9-12m are just a tiny bit baggy.

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Megan GibbsMountain Home, Idaho
    12/29/14
    WIC might be using a breastfed baby chart while doctors use a formula fed chart. I don't listen to the percentiles, personally. They are based on BMI which I think is inaccurate.
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      12/29/14
      When me and my son get weighed at wic it is so far off from our doctors office or from home. I think that the doctors office for us is more accurate.
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        12/29/14
        Megan Gibbs
        I usually go by what my doctor says, also. I was just thought maybe WIC was more accurate because they give us the food, so they need to be more strict so they can adjust the checks accordingly. Although, it's slightly annoying since my first two are so small, but they won't let them get whole milk.
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        12/29/14
        I just had a WIC appointment and they tried to tell me that I had gained 16 lbs in less than a month during my pregnancy, when according to my scale at home and at the doctors office I have only gained 12 lbs my whole pregnancy. You would think like you said that they would be more accurate but they seem to not be.
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        12/31/14
        Megan Gibbs
        Yeah, and instead of making my older kids seem smaller, you would think you would want them to seem bigger so they could take some things out. At the doctors they said my older two are in the bottom 5% and at WIC they're at the 3%.
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          01/14/15
          Bethany Reilly
          Id go with your doctor. At WIC they told me that my son needs to be tested for lead in his blood and at his doctors office they said they don't do that unless he's going into a headstart program. Also, WIC seems very unorganized sometimes.
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          About Megan Gibbs
          Current: Mountain Home, Idaho
          Birth: June 13
          On Moms.com since: Apr 16, 2014
          Finally got a job. Jack in the Box. Not much, but it's something. I'm divorced but in a new, better relationship and he's my new son's father. I'm very happy to have him in my life (my ex is a free loader, currently living out of his car).