Hmm, honestly most of us mums I know started around the 6-month mark itself, but every baby is different lah, some show interest earlier, some later. Your nurse might be suggesting the extra 2 weeks based on your baby's development or just to be extra cautious, so it's worth asking her the reason next time, but if baby is showing signs like sitting up well and reaching for food, you can also check with your pediatrician to confirm if it's okay to start now or wait a bit more.