I would also suggest pointing things out & naming them and their colour/s. Also feeling different textures of things - eg: bark, grass, fabrics & naming how they feel ie: soft, hard, rough etc...
My little one is a few weeks younger than yours and she is still putting things in her mouth (alot) but we do finger painting and suprisingly she doesn't put it in her mouth, maybe it is worth trying? Do you have a sandpit, my DD loves ours.
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