Ay, mahirap yan dahil bawat baby talaga ay iba-iba ang readiness, pero most of us start around 3-4 months pag mas stable na ang head control at hindi na ganitong fragile pakiramdam. Better to ask your pediatrician kung safe na for your baby specifically kasi may considerations like development milestones at kung gaano katagal, basta hindi paulit-ulit na mabilis kundi gentle rocking lang para safe!