I'm always reading something, usually multiple books at a time.
Recently, my family visited a farm that neighbors my parents' summer cabin. We'd been invited over to see a mom quarter horse and her four-month-old colt. Seeing the little colt cavorting and the proud, protective mom-horse triggered a memory I hadn't thought about in years. I remembered a children's book I'd read, sometime in the first half of the 1970s. The story was told from the point of view of a colt who was doted on by the grown-up horses on the farm. He enjoyed being the center of attention, but suddenly that spotlight was pulled away from him when a newborn foal come along. Suddenly, it seems as though every horse in the herd is obsessed by the newcomer! Eventually, the narrator-horse overcomes his jealousy and becomes a friend to the new baby.
Once this memory came to me, I really wanted to rediscover the name of the book. It took some digging, but I found it! It's The Little Fellow, by Marguerite Henry. Here is the site where I found the description.