Laws introduced in the Queensland Parliament this week will see child killers spend more time in jail, as the Queensland Sentencing Advisory Council found the sentences for the manslaughter of a child were inadequate and did not reflect the vulnerabilities of children.

Premier Annastacia Palaszcuk says the legislation would expand the definition of murder, with many offenders being convicted of manslaughter rather than murder due to a difficult in establishing intent.

The Bill will implement recommendations to increase the length of the sentence of manslaughter cases, with the LNP proposing that all child manslaughter cases should also include a 15 year penalty.