Your baby may be shy when you first receive them but will warm up to you very quickly. Remember that they are just nervous and leery of you the first few days. They may squeak when you pick them up or when they are hungry, this is normal like a puppy whining. Holding them close, speaking softly and gentle scratching will warm them up. The babies will need a heat source for the next 3 weeks, if you ever feel like your baby is cold they need to be warmed up immediately and kept around 76 degrees or warmer. Small heat pads tend to be a great addition for a cage set up, but make sure that only a certain part of the cage has the heat pad so that they are able to get on and off.