From http://www.weeride.com/faq
What are the age and weight limits for passengers of the Kangaroo and LTD child carriers?
The recommended limits are 4 years old and 40lbs.
Probably fine on weight. My daughter is >15kg at 3yrs and still in hers.
I’ve purposely left a long steerer on my fork when building the bike so stem is really high and the bars aren’t anywhere near her knees. A longer stem could help but not if it puts your chest into the back of her head.
When the time comes to replace I’ll be looking to buy a Tyke Toter. No UK distro but can be ordered from the states.
https://www.tyketoter.com/