Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to monitor newborn kitten growth [title] Give the kittens a warm bed. [step] During the first two weeks of their lives, kittens are helpless: their eyes will still be shut, and they should spend about 90% of their time sleeping and eating. As long as the mother cat is feeding the kittens, your involvement will be minimal.

Ending1: On average, kittens between the ages of six and ten months old should begin to experience a warm, fluffy bed once they start to realize that they are still comfortable together. [substeps] Most breeders who sell animals produce a variety of stimulant items. Ending2: [substeps] During the third week, gently remove the mother and place her on your lap with her eyes shut for at least 60 minutes. Use a humidifier to help ensure their stools do not dry out. Ending3: The kittens' main source of warmth will be their mother. You can, however, line the box or cat carrier with a towel which can be soiled and washed. Ending4: Do not pick up or play with the kittens. [substeps] Never ever pick up a kitten between its legs.

Answer format: ending1/ending2/ending3/ending4