My 8 mos. /3 weeks old started solids at six months. He enjoys eating but doesn't eat much at one sitting, which is fine as he is still nursing frequently. I recently have tried to give him food just a bit more lumpy than the pureed smooth food he has been used to. He just seems to gag on it. Is this normal or a sign that he is not yet ready to move forward? How will I know when to give him more solid foods?