The woman first blamed her husband for the death of the infant, claiming that he did not want another child.
The couple had two other children, one aged 9 and the other 6.
High Court Judge Teresiah Matheka ruled that there were gaps in the woman’s testimony.
The woman bore the child on April 22, 2016 at Kianyaga, in Kirinyaga County.
She went to her mother’s house and stayed for five days.
On April 27, her husband went for her and they set off for their home in Karatina. Three days later, on April 30, the woman returned to her mother’s house without the baby.
The baby’s body was found in the bush.
She told police that her husband was upset with her for giving birth to another child and that they fought several times about it.
The court heard that the man had left her in 2015 when she informed him that she was pregnant with their second child.
She testified that her husband found out that she had a baby girl and directed that the child be named after his mother.
On cross-examination the woman conceded that she did not report to anyone that her husband had killed the baby because she was afraid he would harm her.
A psychiatric report ruled out concerns that the woman could have been suffering from postnatal depression.
“The inconsistencies in her testimony have not shaken the case for the prosecution or created any doubt in the mind of the court. What is the accused person trying to hide if indeed it is the husband who killed the child and disappeared?” said the judge.
The woman will be sentenced at a later date.