1. A good automatic breastpump (if you wish to breastfeed your baby).
This is for sure our best investment (or maybe the second best after the stroller), even though I didn't use it as much as I expected. A good pump is necessary for two reasons: if the mother has too much breastmilk it is good to extract some of the leftover milk after the baby has been fed and that way to prevent issues like clogged channels or even mastitis.
If the mother has too little breastmilk, pumping often might stimulate the milk production.
There are different kinds of breastpumps on the market. My recommendation is not to save money on this item because a good breastpump could save many problems and most probably will help the milk supply to be maintained in good levels. Automatic is always better because if you have to pump often with a manual pumt, it becomes a very tireding excercise.
2. A good sling or a baby carrier (suitable from birth).
I read a lot of reviews of such items before giving birth but I ended up not buying one. Eventually I received two used carriers as gifts (thank you, my dear friends!), but they were not very suitable for my baby. He is now way too heavy for me to be able to carry him more than 10 minutes without having a strong pain in my back. Also I suspect that these carriers are made for babies smaller than my son's current size... Or at least that's my impression because I didn't find any instructions and description for them.
I recommend the carrier or sling to be bought right after the baby is born (or a month later). Ideally the mother can go to the store and try it out together with her little baby in order to understand if it is confortable for both of them. If you decide to buy a sling, consider getting one with both standing and sitting position because as the baby grows, he/she wants more and more to stay in a vertical position. This is my biggest challenge now because my baby loves staying in a carrier but I just can't bear it any more for a long time.
Some people say that their babies don't like slings or carriers. I believe that with most babies this wouldn't be a problem if the mother starts using such item the earliest possible. But probably there are diferent cases so it is also a good idea if you can buy the sling with a possibility to be returned within a month or so, in case you don't like it.
3. Elastic baby clothes
By elastic I mean such clothes that can strech. Consider buying mainly stretchy clothes in the first year of your child. They have two advantages: 1. It is easier to put them on a constantly moving and not colaborating baby; 2. As the baby grows very fast in the first months, the clothes that are stretchy last longer because they often fit even if the kid is already big for the relevant size. I didn't consider this and bought many not elastic clothes which ended up to be the ones used less time.
4. Bathing net
There are nets which can be attached to the baby bath tub in a way that the baby is swinging over the bath tub without touching the water. The net is used before the baby manages to sit. This item is especially useful if only one person has ro bath the baby (but I have to admit I haven't done it alone) because there is no need to hold him/her with one hand all the time. The only disadvantage of this net is that the baby is not in the water and can get cold. To avoid this the parents have to pour water on top of the baby all the time. Nevertheless the net was one of the most useful things we bought (and probably one of the cheapest :))
5. More drawers
If all your drawers are almost full before the baby is born, consider buying at least one new piece of furniture with at least 3-4 extra drawers. The little new person in your life is tiny but his/her belongings are increasing progressively. There are many items that won't be used any more within only 3 months from the birth and even if you decide to give them away you might have to keep them for some extra days or weeks. In the meantime new things are being bought... Well, 4 new drawers are tottaly not enough, at least they were not for us.
What are your top 5 most useful baby items?