Excerpt from this article:
Any old influencer can market tea-toxes or gummies that claim to give you better hair, but not everyone with 100,000 loyal followers on Instagram happens to be pregnant. “If you’re a baby company or if you’re putting out a product for a mother that’s about to have a baby or if you’re currently pregnant, you’re kind of limited in the amount of influencers out there to work with,” he explains. “So, as you can imagine just for supply and demand, it makes you a lot more valuable because the pool of talent is very limited.”
And then there’s the fact that many of these moms are American millennials selling to other American millennials, all of whom are well acquainted with the act of making a purchase on their phones. Instagram shopping in general has boomed, in part thanks to a new class of brands existing mostly or entirely on the platform.