It's normal for a baby amazon to be quiet. Just give them time until they find their voice.
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Amazon parrots:
Amazon parrots are one of the birds that exhibit personality traits as babies that they do not typically carry on into adulthood. “Baby Amazons are often timid and reserved,” Soucek said, “however those aren’t words you’d usually apply to an adult Amazon!” Adult Amazon parrots are typically described as bold, lively, feisty and gregarious. But young Amazon parrots are shy around people and are often intimidated by other larger parrots that may also be kept in the breeding facility.
During the early hand-rearing phase, Amazon parrots tend to be relatively quiet Saydak said, “in that they do not make many natural sounds. They do squawk occasionally when annoyed with something.” Amazon parrots often begin mimicking human speech during the weaning period. “It is not unusual for unweaned blue fronts, double yellowheads or yellow napes to enunciate several simple words and phrases with relative clarity such as ‘Up’ and ‘Good bird,’” Saydak said.
Mississippi aviculturist Nancy Speed, also breeds Amazon parrots. Hers are very content to remain in their cubicles in the nursery until they are at least 8 weeks old, without venturing out. “The first flight is often clumsy, and landings can be tricky,” she said. “But they learn quickly. As I watch beginners fly, I can almost hear them think, ‘Wings down, feet out!’ before attempting to land.”
Amazon parrots usually fledge between 3 and 4 months of age – and that’s when they really start developing their independent nature, Flowers said. He has an open area in his aviary where different species can interact with each other. “Our Amazon fledglings are usually more curious and eager to explore than grey parrot babies or cockatoo babies,” he said. “The Amazons are the first to establish their favorite perch and will defend the perch from other birds.”
http://www.birdchannel.com/bird-species/baby-birds/baby-parrot-development-stages.aspx