we have hatched 3 chicks about a week ago and today we had to help a rhode island out of the egg but we are concerned that it is not quite right. It seems to have a sac attached ( either a growth or the yolk) it seems to be moving a bit more but we are concerned that somethng is wrong .. When we helped to hatch our marans it seemed that the membrane dried out to much due to the heat inthe bator ... can anyone shed light on this growth / yolk sac ???we are very new to this and are worried we have jumped the gun !!