My hens just started laying eggs last Sunday so I started the layer feed and put out the crushed oyster shell. However, some of the eggs are so delicate that I either find them broken or they break when I pick them up. The shell is tissue paper thin. They hens are only 20 weeks and the eggs are pretty small. Is the thin shell and small size normal or am I doing something wrong? I wasn't expecting to get any eggs yet, but already getting four a day. Some have a strong shell and some dont, but they are all small in size. Also, it seems everytime I go into the coop, one of the hens, a buff orp, wants to approach me. I don't know if shes trying to protect the other 17 or if she just likes me, but is this normal behavior. When I try to pick her up, she crouches down and becomes stiff. What is that?