Think about this for a moment. You don't have a belly button unless your mother is a mammal type of being. What has eggs? Birds and reptiles. But, if they had belly buttons that means that they were not reptiles. So, what does that mean?
It means that they nursed their young like humans and primates do now and like lions and tigers and horses and cows do too. So, it means the mothers had wombs and placentas and had natural childbirth but not eggs that mature outside the body before they hatch. So, they conceived and delivered their babies like Humans and primates do. This also can lead to a long rearing process which can develop a mind quite a ways including learned behavior like sounds and somewhat of a language like crows have as a species where different sounds mean different things. So, there are many more questions than answers to say that dinosaurs have belly buttons.
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