When should you introduce solids to babies?

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My nephew just turned four months old two weeks ago. He is a pretty healthy baby. We are happy that he has never gooten sick once and has a healthy appetite. In our family, we really enjoy eating and we are really looking forward to the time when we can introduce him to solids. The doctor said he could start eating at 5 months but some say that a baby can start eating at around 4 months. We are really excited to see him eat. And he really makes a grab for food whenever he sees us eating and it makes us even more excited. When could we start feeding the baby solid food?