My dd just keeps screaming, for no/any reason and its not funny anymore, help!

[littleducks]

my dd is 4 months old and is quite vocal, she is a happy baby but she has a really bad habit of screaming at first i thought it was a novel "look what i can do" thing and didnt mind. Now i constantly have a head ache. She doesnt scream when she is hungry//trapped wind/tired/stuck trying to roll over but the rest of the time so its not a distress thing.

For example she will hold two toys on play gym and scream relentlessly at the third, bites her teddy and screams at it.

Im at my wits end what can I do?

DS did this, drove me nuts. He grew out of it about 6 months when he learned to mmake other more interesting (and thank goodness quieter) sounds. No advice, lots of sympathy!