You must correct for your baby's actual ages when considereing milestones. Your one twin is certainly ahead of expectation with regard to his milsestones as he is almost ready to sit by himself. This milestone is expected at about 6 months. Your other son does not have head control yet.This should occur at about 3 months and his corrected age is at least 4 months.
If your twins are content and gaining weight there is no need to hurry with starting them on solids but if they seem to be hungry after feeds you can certainly start them on a rice ceral now. Their daily fluid requirements are 140ml per kilgram body weight per day eg 4kgx140=560ml per day
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