Smell is the sense that has one of the most direct links to memory. You smell something, like apple pie and it brings you back to your grandma's house as you eat the apple pie with a big head of vanilla ice cream from those delft blue bowls of hers. There's this study that showed that students exposed to a scent while studying and then the same scent during a test did better than other students without the smell-enhanced memory.
I've switched Alex's shampoo a few times, trying to save a bit of money. One bottle was supposed to be "lightly scented" which apparently means "old french whore perfume". I missed how he used to smell. So I went back to the expensive stuff. I smelled his head tonight as I fed him the bedtime bottle. Mmmmm, that's better.
Before Alex was born I remember buying the baby shampoo and thought I might not even need this shampoo for months. My baby could be bald. Hoo boy I was wrong. He was born with a full head of dark hair. That was such a shock when I first saw him. All that hair! It was completely unexpected. He had his first haircut when he was six weeks old. Silly baby was pulling his hair in his sleep and then waking up and crying because someone was pulling his hair. The more he'd cry the more he'd pull on his hair. Silly baby! He's had four haircuts already. If we hadn't cut his hair he'd be sporting a head full of elastics and sparkle hair clips.
So getting the old shampoo did the trick. I remember holding my freshly washed teeny tiny baby. Wrapping him up in his hooded towel that's now way too small for him. Being terrified of giving him a bath because he was so small, such a bobble head, so slippery. Having to move the baby tub into the big bath from the kitchen counter because his splashing was soaking the whole kitchen.
New baby smell is the best. Even if the baby isn't so new anymore.