Some women complain of bloating after starting hormonal birth control. This side effect normally goes away within the first three cycles. If it lasts longer, or is bothering you, contact your health care provider, who can talk about options for changing the type or brand of Birth Control you're using.
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It's possible. Hormonal birth control pills contain a synthetic estrogen. Because estrogen is a female hormone, it can cause breast tissue enlargement or overall weight gain. It depends on which brand of pill you take and what active ingredients are in it because some are more apt to cause weight gain than others.
In short, yes, it could- but you're more likely to experience overall weight gain than just on the butt.