How about a soft blanket or a plush toy? A teething ring would also be a good choice, as would a rattle or baby-safe mirror. If you're looking for something more educational, there are plenty of baby toys and books with bright colors and engaging shapes. You could also consider a cozy outfit or a pair of cute socks to keep them warm and comfy. Whatever you decide to get, make sure it's safe for an 8-month-old and appropriate for their developmental stage.