Hi there I would think it is either developmental (ie he knows he can do more for himself) and he thinks heck I can eat what I like I dont need to eat it all, so much to go and explore.
Next thing is that you do see a slow down at this age sometimes, as my hv said, if they continued to put on weight at the rate they did as babies they would all be little blimps.
Next thing to consider is he may be teething, or maybe coming down with something
My hunch is it is just a phase and yes dont worry he will not starve himself as you said, welcome to the lovely world of being a toddler, DS is 2 1/2 and is having yet another one of these phases, oh the joy, some days he seems to get by on one piece toast
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