Hi, I had this problem and started giving my lo a tsp of baby rice at teatime when she was about 17 weeks old. My hv said it was ok because back in "the old days" they used baby rice to thicken milk for babies that had bad reflux to help it stay down. I managed to keep with just this till she was about 20 weeks old then started with veggies. She is 6 months now and just havin mini versions of our meals. There are indicators to look out for to suggest they might be able to manage with food, things like sitting up unsupported, putting things in there mouths and biting them, the list goes on, google it or ask your hv. Have you tried offering more milk more often, it could just be a growth spurt. My lo was on 8oz every 3 hours in the day, it was getting rediculous! Hope I havn't just babbled on! lol! Natalie x