I am a brand new chicken mommy, and brought home three hens (hopefully) - a Buff Orpington (4 weeks), an Ameracauna (3 weeks), and a Gold Laced Wyandotte (3 weeks). Since it has been mid to upper 70's during the day here in TN, I took them outside for about 30 minutes today to peck and scratch in the grass in a 5' diameter play pen. They seemed to love it. Then back to the brooder they went. My question is - do I now need to supply them some grit, or will they instinctively get what they need from the ground at that age? I'm a pretty nervous new mama - I don't want them to get stopped up!