My 18 week old sex link weighs 2lb 4oz the same as yesterday. She is supposed to be laying eggs in a month's time but seems so small. She spends most of her time sleeping in the sun and does not eat much. How heavy should she be at this stage? Her dad was a RIR and her mom a Plynmouth Barred Rock. She should be about 5lb fully grown. She seems well. Am I just being over-anxious?