The so-called "two-child benefits" are aimed atsaving money for the state and intended to influence the behaviour of less well-off families by making them think twice about having a third child.
"These changes only affect children born on or after 6 April 2017. If all of your children are born before this date, your Child Tax Credit won't change," said a notification from Her Majesty's Revenue and Customs (HMRC).
Child Tax Credit is paid by the UK government to low income families to help parents with the costs of bringing up a child. The amount of money parents are entitled to depends on factors including income and other circumstances.
Analysis by Policy in Practice consultancy found that a low-income family in the UK whose third or additional child is born before midnight Wednesday would qualify for up to 50,000 pounds in tax credit support over 18 years whereas a similar family whose third child is born today will miss out.
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The credit can be claimed by any British national based on the earnings criteria set out by HMRC.
Historically, there has not been a limit on how many children a parent can claim for but from today families can claim credits only for their first two children.
The change had been announced by former UK Chancellor George Osborne but is coming into force from this week.
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