Re: Several questions on feeding my 13 month old son
If you're still nursing him I wouldn't worry the least bit about him not liking whole milk. If you want him to eventually drink it you can just keep offering it to him and he may or may not drink it. It's not absolutely necessary, though.
At 13 months, dd was eating 3 meals and probably 2-3 snacks per day. I can't really say about the jars because she was eating table foods and I didn't really measure how much she was eating.
Have you considered dropping the jars and just offering him whatever you are eating? He might be more excited to eat if he sees that he's getting the same thing mommy and daddy are getting. THat cuts down on the stress for you, too because you can just serve him and let him eat on his own time while you eat your dinner on your own time.
Either way, I'd say that with that much nursing you don't really need to be overly concerned with how much he is eating. Definitely keep offering foods, offering a variety of foods in different textures and flavors and let him play. Keep offering things you don't think he likes because he will change his mind constantly, I know my daughter does.
Try not to make it a stressful situation for you or him, because it doesn't need to be and that might affect his willingness to eat, iykwim. When you offer snacks, you might try just setting a plate out on the coffee table (or wherever) while he plays so he can graze on the go.
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