Seriously tho, what age because it makes a difference.
less than one- walk them around, bounce them lightly, talk about everything and anything (including the game yes) if they gurgle pretend the responded to something you said and acknowledge them by saying their name and smiling and asking them to tell you more or asking them a question and wait half a moment to ‘let them respond’
1- help them walk or crawl, roll balls to them, point out animals and moving oblects like cars, trains, airplanes, bugs, name objects and colors, read simple books, tip them upside down while sitting on your lap, build towers. Use ‘command language’ i.e. simple phrases, but talk ‘normal’ otherwise
2- throw balls, kick balls, point out more advanced things (especially vehicles) wrestling play is usually liked, also things like horsey, airplane, build towers and knock them down, build them again. Use simple sentences when giving commands but talk normal and repeat phrases using ‘their’ vocab if you know what it is
3- more wrestling play, chasing games, kicking and throwing and batting balls, playing with trains (building tracks), puzzles. Just talk normal and repeat things as you need to or say it in a slightly different way if they say they don’t understand or look confused.
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