my 8 month old is not responding when her name is called. i could say her name 400 times over and she won't look up at me. (she will look at me straight away if i make an unusual noise like whistling). she also doesn't look at the right person when you ask "where's mommy", "where's daddy" and doesn't seem to understand any other common words yet either (like "up", "book", "bottle" etc).
are there other people whose babies also started understanding words late and are now developing on track, or should i be worried?