You've always known that you and your baby are two separate people, but she hasn't. To her, the two of you are one. That's because your baby has no sense of her own identity yet. When you put her in front of a mirror, she doesn't even realise that the baby she sees is her. But this month she'll make a huge mental leap and finally understand that she's an individual with her own body, thoughts and feelings. This jump in understanding boosts her growing emotional and physical independence, but these will take years to develop fully.