How can I engage and entertain my 4-5 month old baby?

At this age, babies are becoming more active and often get bored or fussy when lying flat. To keep them engaged, try using high-contrast or sensory-focused toys like board books with different textures (feathery or crinkly) or finger puppets to tell simple stories. Tummy time can be made more interesting with "peep-hole" books or musical toys that feature gentle movement. It is also helpful to rotate a variety of simple items—such as safe, soft household objects like large diaper packaging—every 15 minutes to keep their attention, as their interest in any single activity is often fleeting.