Less serious side effects may include: headache, dizziness, drowsiness, feeling tired; dry mouth, hoarse voice; dry eyes, blurred vision; nausea, loss of appetite, upset stomach, heartburn; mild constipation; or; fever, sore throat, body aches, or other flu symptoms. This is not a complete list of side effects and others may occur.
The first set of molars is called the one year molars because almost all children get these molars sometime relatively close to their first birthday. This might be a bit before, or as late as six or eight months after he turns one.
They are baby teeth and will eventually fall out to be replaced by adult teeth. The first 'adult' molars come through at around 6years of age, the next lot at about 12yrs & the last lot (if they make it past the gum line) are the wisdom teeth which come between the ages of 17 - 21 generally. For a 3D model & a good stage by stage description please refer to the related link.