At 4 months, a baby can usually keep his or her head firmly without assistance, and at 6 months, he or she can sit with a little assistance. He/she sits effectively without assistance at 9 months and gets in and out of a sitting posture, but may need assistance. He/she sits up without assistance at the age of 12 months.
This Video Should Help:
Babies start to sit up and crawl when they are between 6 months and 1 year old. Reference: when do babies sit up and crawl.
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