How to teach baby sleep on a mattress

Hey all. My baby is 4 months old. he did not like to be laid down to play, and he had difficulty sleeping without a cradle. when I laid her on the mat just 20 minutes after that she would cry. since he was born he doesn't like to sleep on a you have a baby like me? and how can I teach my child to sleep on a mattress?

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My baby sleep on the mattress , maybe you can find some toy to distract him...