Adult-sized alien child and child-sized alien adult

I was reading this question, and it made me wonder if something like this is possible or not.

So, the question is, Is it possible to have an alien species in whom, the newborns are bigger than adults and as they grow up (or grow down), their size reduces?

They have to be an intelligent species, though I am not particularly looking for space-faring civilizations, cavemen type aliens will work too. And no DNA tweaking or artificial enhancements are allowed, It has to be a natural evolution.

Edit: What if we allow DNA tweaking and artificial enhancements. Like some advanced alien race performing experiments on cavemen like aliens for some reasons.

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Adult-sized alien child and child-sized alien adult

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