My son used to have an exersaucer. Its good to let him be occupied and we can have some handsfree time. I let him sit on it for about 20-30 mins interval each time. Otherwise, i will put him in the cot.
I also got a bumbo when he was 4 months, but his thighs never fit into it. So it was a waste of money.
I guess a bouncer would not be necessary. After sometime baby will try to sit up, it might not balance well.
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