Perhaps there's something wrong with ours, I can't believe the other reviews.
If you leave Milky in sleep mode (without turning off at the switch) as our daughter did as she wanted to take Milky to bed, you'll need to replace the batteries every day. So we don't let her play with it before bed now.
Our Milky is two to three months old, has been played with about four times and we've just turned it on, and replace batteries today, to find her carrot won't work at all. I can only guess it's the sensor in her face but she'll do everything else.
I came on here to look for something better and was surprised to see so many good reviews. It could just be ours in which case I should contact the manufacturer.