Your baby needs only basic, lower regions of the brain, which she already has up and running, for associative learning. A 2-month-old can remember an event for a day or two. A 3-month-old can remember an event for roughly a week—but if babies are given reminders, the memory lasts far longer than this. At 6 months, development of areas like the visual cortex and the hippocampus are thought to make babies more particular and specific when it comes to associations. At this age, you might notice that if you try to change something about your routine or habits even slightly, your baby protests!
