A child advocacy group has criticised the sentencing of a Canterbury man who sexually violated his 13-month-old son as weak.
The man, who has name suppression, was jailed for eight years and 10 months nd must serve at least five years of the sentence.
In February, three New Zealand men were charged with a range of sexual acts on four boys between 13 months and 13 years of age.
The Canterbury man had admitted to 27 charges including indecent assault, unlawful sexual connection with a boy, and making, possessing and distributing objectionable images.
At the Oamaru District Court on Wednesday, Judge Joanna Maze described how the man filmed his 13-month-old son in a sexually indecent way and put images and videos of the acts on the internet.
Denise Ritchie, founder of child advocacy group Stop Demand, says the sentence is not enough to deter other sex offenders.
She says the sentence should have reflected the fact that the victim's abuse was captured on camera and posted online where it will be replayed by men around the world forever.
The man's conviction is the second in a national police operation that began in July last year.
Last month Aaron Ellmers from Hawkes Bay was sentenced to preventive detention with a minimum jail term of 20 years after pleading guilty to 60 charges of sex offending against children.
An Auckland man, whose name is suppressed, has pleaded guilty to 20 related charges and will be sentenced later this month.