not recommended yet. for 3mo baby you can focus on training their neck muscles or you can prop them 45deg on a pillow but not on a sitting position. their spine is not ready for such a position until about 5 months old.
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3 months is too young! The spine is not fully developed yet take it slow mummy lo will show you signs once they are ready to progress further.
Please don't. It's best that lo train the neck first. You can do that by increasing tummy time.