The Manhattan Toy Company's Skwish is one of Ruby's favorite toys now (at 6 months), and one of the first ones that she started grabbing for and holding purposefully when she was still tiny. It's easy for little mini-hands to grab with so many skinny areas and makes an interesting sound (with the moving beads in the middle) that is attractive to babies. As you can see from this video, the Skwish can entertain Ruby for long periods of time.
Even though it is marketed for 6+ months and it seems to be very sturdy, it still makes me super nervous sometimes when she chews on it because I am afraid she'll pop off one of the wooden balls. Probably unfounded, but I still watch her like a hawk when she's playing with her Skwish! I don't want Ruby to be a stat in a toy recall.