sat or set
He sat at 3 month
He set at 3 mont
He sat at 5 month, started to crawl at 6 month, was able to stand up at 10 month and started to walk at 12 month.
I believe you are asking about the difference between "sit" and "set":
"sit" refers to the activity of sitting, as in he sits in that chair every day; he sat in that chair yesterday; he has sat in that chair every day this week
"set" refers to putting something else somewhere, as in he sets his book on the table every day; he set his book on the table yesterday; he has set his book there every day this week
So in your sentence, "He sat at three months" is correct.
|link comment||answered Jul 22 '13 at 18:50 E Berriman New member|
'Months' should be plural, and the 'Oxford comma' is preferred for the last item in a series. In the US, we usually use 'sat up' in this context, but it may be different in other places.
He sat up at 5 months, started to crawl at 6 months, was able to stand up at 10 months, and started to walk at 12 months.
|link||answered Jul 22 '13 at 15:53 Lewis Neidhardt Grammarly Fellow|
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