The number of three to four year olds able to speak Welsh decreased from 16,500 in 2011 to 11,950 in 2021, a decrease from 23.3% to 18.2%.
Gostyngodd nifer y plant tair i bedair oed a oedd yn gallu siarad Cymraeg o 16,500 yn 2011 i 11,950 yn 2021, gostyngiad o 23.3% i 18.2%.