I have 5 chickens 3 just turned 5 months 1 will turn 5 months on the 12 and one just turned 4 months on the 2. Anyway all the chickens that turned 4 months last month started laying at 4 months. I think this is because we gave them vitamin water in their first two weeks and then chick feed for the first 4 months of having them and then went to chicken feed. I think it caused them to begin to lay eggs faster. What do you think?