My boy 2 months plus have colic and I want to buy a baby carrier so I can bring him out to nearby shopping center without putting him in a stroller to cause him too much stress. And reduce the colic if I am outside with him. But should I buy a sling or a carrier? Is ergobaby airy 360 good? Because is quite expensive so I want to know if it is worth the investment. Can mummies recommend me any good carrier? Tula is good but is more expensive than ergobaby :(