Forgive me folks but your baby isn't 'playing you'... they don't have the mental capacity to think something that complex out...
Also there's no good research to suggest that holding your baby is going to make them more needy in the future or more wussy or whatever.
Parenting skills adjust to the level of the child, and at this stage those babies just came from an environment where they had human contact 24/7! Even if you hold them 12 hours constantly that's still only half the human contact they are used to.
You may be surprised at how much more independent your babies are at 3 months old, when that last (4th trimester) development is complete. Their brains are a lot more developed, they have bonded with you and their senses are a lot more developed and they can 'explore' their environment. Also by then they've learned how to 'self soothe' and may not need to be held as much.
In non-industrialized nations where mama's don't put their babies down things like colic are unknown and unheard of, and babies rarely cry.
You might consider getting a sling or carrier so you can continue with your daily business and still give baby Keira the comfort she's seeking.
Anyway, just food for thought