Love doesn't help if you think babies don't need eye contact and conversation. Huge numbers of parents think there is no point talking to babies of three and even six months, t v better than nursery rhymes. Toys, washing and clothes matter less in many ways than cuddles, talking and eye contact.
The investment needed is in family support, 0-3 support, we have never invested in the younger years. The disadvantage aren't just language delayed, they can't sit still and listen to story books, play imaginatively, make rhymes, read body language regulate their emotional responses...
These children don't learn at school because they aren't ready for school, many aren't toilet trained, can't put coats on, follow verbal instructions or negotiate and self regulate. They don't thrive in any school which is why demographics determine outcome so clearly.
I saw two children from abroad enter a v low attaining comp, they excelled in sport, academic work and everything else as they mastered a new language. They school gave the same intensive support to other gifted children. The two incomers went on to great things, most of their gifted peers didn't. The difference was the parenting not the access to education, music and sport. My children went to a special measures primary, never got extra tuition went through local low attaining comps. No tuition or hothousing, they excelled did as their friends who had similar parents. These anecdotes are typical, it's what the research shows. It's no surprise to neuroscientists.