I am in Massachusetts and I'm looking to get Baby chicks on March 9. How long do they need to be indoors.... When can I start putting them in their coop? My concern is that they will get big fast and it will still be too cool to put them outside. Would a heating lamp in their coop suffice when they are just a few weeks old? I can wait and get them at a later date but I'm so anxious Thank you in advance!