While not an absolute necessity, a sleep sack can still be useful for a 12 month old. At this age, sacks provide warmth and a cozy contained feeling without the need to tuck in loose blankets that could pose a safety hazard. The sack helps prevent startles that may wake baby up. Some parents use sacks to discourage climbing out of the crib. For active toddlers on the move, a sack makes nap transitions easier.
Yes, sleep sacks are generally safe for a 9-month-old. At this age, many babies are still using sleep sacks as a secure sleepwear option. Sleep sacks reduce the risk of suffocation from loose blankets and provide a cozy sleep environment. Ensure the sleep sack is the appropriate size for your baby's weight and height and choose the right TOG rating for the room temperature. As babies grow more mobile, some parents may opt for sleep sacks with foot openings to accommodate walking.
The main rule for baby sleeping bags is safety and comfort. Choose an age-appropriate and properly fitting sleeping bag. Check the TOG rating to match the room temperature and prevent overheating or chilling. Avoid using additional bedding inside the sleeping bag to reduce suffocation risk. Always place your baby on their back in a crib or bassinet with a firm surface.