The current Junior ISA limit is £4,368 and this is the total anyone can invest across both types of Junior ISA for the child in each year.
The Government sets the ISA limits and rules, so these could change in the future, but here's a quick overview of the current ISA allowance basics.
The current ISA limit is £20,000. This is the total you can save and invest in all types of ISA throughout the tax year (which starts on the 6th of April each year).
To be eligible for this tax-free allowance, you have to be over the age of 18 years (16 for a Cash ISA, not offered by Scottish Friendly) and a resident of the United Kingdom.
You can't carry any of your allowance forward into the next tax year so, if you haven't used your full allowance by the 5th of April, you simply lose it.
Like adult ISAs the Government sets the Junior ISA limits and rules, and tax treatment depends on individual circumstances. This could change in future.