Took toddler to ER

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Good morning ladies, I took my 2 year old daughter to children’s hospital yesterday because she had kept pointing to her stomach saying “ow booboo” for about 2 days and yesterday it was worse. They did an X-ray and said she was filled with poop which I was very shocked about since she has more than 1 bowel movement a day and it’s always always always soft stool..never hard ever. They gave her an enema which of course she used the bathroom and sent us home with miralax to give her for 7 days. Has anyone else went through this? I figured it she was constipated she would have hard stools or trouble going. She also eats a very high fiber diet. Loves broccoli, only eats whole grains, berries and such. I just hate seeing her in pain but this hasn’t happened yet to her