This came in an email yesterday:
hi (sic) Katherine,
your baby is 32 weeks old!
Separation anxiety is common now because your baby understands object permanence: You (or an object) still exist even when out of his sight. Play more games such as patty-cake and peekaboo. Spend a lot time talking, labeling objects, reading books and naming pictures on a page.
Babies are solipsists until they are seven months old.
AND NO ONE THOUGHT MY PHILOSOPHY DEGREE WOULD BE HELPFUL.