What kind of signals do babies give to their mothers when they are ready to add complementary foods?

1. The baby’s head can be straightened and can turn freely. 2. The baby can sit up against it. 3. When food is near the mouth, the baby’s tongue does not always push the food out. 4. When the family eats, the baby wants to scratch or lick his/her lips and shows interest in new foods. 5. The baby’s height and weight indicators have been normal before, but recently they have fallen behind the standard.