My little one will be 5 months soon, so I was wondering what toy is worth investing in. So far his only toy is a teether - sopie giraffe. Will like to expand his "toy collection" soon. Please suggest.

At 5 months old, they are beginning to have a sense of self, so toys with (infant safe unbreakable) mirrors are a good choice. Toys with textures which make different sounds are recommended as well. Have you heard of Lamaze/Sassy toys? Their toys are meant for infants and brightly coloured with different textures and sounds to entertain your baby. http://www.fisher-price.com/en_US/playtime-guide/5-months/index.html