I wonder if the cross shaped ones are easier to push than the square ones? My chicks are older but haven't figured them out yet. They peck and peck, but not hard enough and not in the right spot.
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These are the ones I use: https://www.mypetchicken.com/catalo...cken-Watering-Nipples-size-options-p1861.aspx
That said, it does take some learning. I remember spending one good Saturday doing house chores all day, walking to the brooder every 15 minutes to poke each nipple so that a little droplet of water sat on the little shelf under the nipple. Sometimes I'd spend some time watching them and when one went to drink the water droplet, I'd stick my finger in there and poked at the nipple to release more water. They'd watch. One by one they figured it out. <-- during this whole day, I removed all other sources of water. My sense was that as long as there was an easy and familiar source of water, they'd prefer that over the strange new things.