I need new ideas of ways I can keep weight on my child?

My son was losing weight so I gave him food with added calories such as butter in his veggies. Very little peanut butter on snacks, pediasure whole milk and much more. He was gaining weight but appears to have stopped and is tired most of the time. He was not before. I will of course ask his doctor but does anyone know what else I can give him beside what I described above to help him gain and keep weight? Thanks.

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Kelley
    08/12/14
    Organic Toddler formula may help.
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      08/16/14
      Kelley
      The doctor agreed he lost too much weight. He was back down to his weight in Jan and hasn't grown much in height to account. Thanks every one for your advice.
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        08/16/14
        Kelley
        I should have mentioned that my son was born prematurely and doctors had me add formula to my breast milk to help him gain weight. He was born 4 lbs, I took him off the formula so I could breastfeed and not bottle. It took several months before he started losing weight. I feeding him too healthy like he was a full term baby.
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        About Kelley
        Birth: December 31
        On Moms.com since: Feb 5, 2014
        Married to my high school sweet heart. I am a Christian and a mommy. We had a miscarriage then a few months later was pregnant again. I love being a mom, dancing, scrap-booking and blogging.