4 week old trouble pooping

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Our 4 week old formula feed baby girls is super content and happy but really struggling with the pooping. Consistency is fine and not too hard, but she is straining all musclea in her body trying to poop every 4-5h and its taking her hours to finally get it done. Would love to help her out but nothing seems to work!!! Anything i can do to make it better? Its not gas, its poop and at the end of it she is litterally exploding…