According to hotelsoflosangeles.com travel data, there are 67 child-friendly deals to choose from.
The Line Hotel (rating: 6.4/10): a family-hotel with an outdoor swimming pool, a golf course and porter service for 256US$ per night.
The Athletic Club rated 8.2/10 is also a good option with an outdoor swimming pool, an indoor swimming pool and concierge service. You may book an air-conditioned, welcoming and non-smoking room equipped with a laptop, a work desk and a mirror for about 249US$ per night.