Another thing you may want to take notice of, is that your baby may think he/she is ready for solids, may be grabbing food off your plate, and enjoying the new taste. But later in the day, the baby may have an upset tummy, become constipated, or you may see the food come out in the diaper, in the same form as when it went in, completely undigested. Your milk is remains the perfect nutritious food for your baby, until his system is ready for table foods. If you've started solids, you can stop, and try again a few weeks later. Also keep in mind that four months is the bare minimum age at which your baby might be ready for a taste of solid food. It's much more common for a baby to be ready for solids later in his first year.