Josefa, this is an important topic!
When it comes to baby clothing, it’s definitely important to use washable materials.
Even though fuzzy and fringed yarns might look warm and cozy, it’s best not to use them.
The most suitable materials are cotton, baby acrylic yarn, and sock yarn. Tested for harmful substances, of course.
All three types are very washable and durable.
In preemie wards, hats and booties made from sock yarn are often used, preferably yarn that is really soft and doesn’t scratch.
Instead of regular buttons, you can use snaps that are pressed into the garment. Short (!) ribbons or securely sewn-on Velcro fasteners are also suitable.
Please do not use long ribbons, as they tend to get tangled in the little hands or, in the worst case, wrap around the neck.
Large stitches and openwork patterns are also not suitable for babies, as their fingers can get stuck in the holes.
The last baby I made a gift for received the hat shown above with the cuddly bunny. The hat is made of a cotton blend, smooth and pleasantly soft at the same time, and the bunny is made of saliva-safe cotton yarn. The ears and head are securely sewn on, and the rest was crocheted in one piece. I embroidered the eyes and nose, since loose, glued-on eyes and, in some cases, even “safety eyes” aren’t suitable. Babies like to explore with their mouths, and an eye like that can quickly be chewed off and swallowed, especially when babies are teething.
On the topic of safety eyes:
These are often sold from China in large quantities in convenient multi-compartment containers.
It’s a great thing; I’ve enjoyed using them for decorative amigurumi or for older children. But especially with crocheted items, the eyes can come loose because the stitches may be too large or the fastening washers aren’t secure enough / are too large for the eye. Often, these inexpensive eyes also aren’t neatly finished and therefore have sharp edges. I’ve even had an eye break before, likely due to defective material.
The ears on the baby hat are also sewn on very securely.
I hope I was able to share a few helpful tips, but there’s still sooo much more!