https://apnews.com/dc5f7f52b3e21c4b1abf59a95613c697

Pfizer now hopes to tell U.S. regulators how well its COVID-19 vaccine works in the littlest kids by late May or early June.

Pfizer is testing three extra-small doses of its vaccine in children under 5 after two shots didn't prove quite strong enough. Initial results had been expected last month but the company laid out the latest timeline Tuesday during its discussion of quarterly financial results.