sunflower,
why cannot buy the beanie? if you managed to buy riped one, then can just mash and feed your boy. if it's unripe, try putting it in a brown paper bag to speed up the process to let it ripe (never put unripe avocado in the refrigerator if not it won't ripe). when riped, it should be soft when gently pressed (thus easy to mash). avocado no need to steam. if it just won't ripe, just blend and feed.