She lived with Hemana and Ms Taylor at their Mangere home and said baby Cezar had been a talkative, happy and laughing child but went "downhill".
"He would eat but would spew everything back up. His colour was off and he would cry all the time... He was like a grey, a pale grey."
She said she asked the couple if they had taken him to a doctor.
"They said they had booked him in but I don't know if he went or not,"
Under cross-examination from Hemana's lawyer, Steve Bonnar, Ms Wright said Hemana told Ms Taylor to take Cezar to the hospital on numerous occasions.
She said her cousin was a good caregiver to Cezar and fed and changed the boy.
"From what I saw, he was doing everything for that baby."
Ms Wright also told the court about baby Cezar's last moments at home, and said she woke on July 23 when she heard Cezar cry.
"It wasn't a normal cry. It's like his face was covered, like a muffled sound."
Ms Wright wiped tears from her eyes as she recalled that baby Cezar did not respond.
"I picked him up and he just went limp."
Cezar was taken to hospital where he died five days later.
Hemana went on the run from police for five days and text messages between Hemana and Ms Wright were read to the court today.
In one of the messages Hemana told Ms Wright: "Cuz, this is going to get landed on me, straight up. I might have been rough but not evil like that."
The trial continues.
