infantile

infantile paralysis

They and the old North London tanks at Richmond long ago were the first engines on which my infantile eyes rested, be it said with an admiration that the years have never dimmed.

Eustace gaped at him in amazement. When his urbanity dropped away from him, as now, he had an innocence of expression which was almost infantile. It was as if the world had never touched him at all.

Left-wing communism is an infantile disorder.

"Left-Wing" communism is an infantile disorder.

There have been several cases of infantile paralysis.