I listed out all the baby necessities and purchase them over time slowly starting from second trimester, when the baby gender has revealed. If I can get good deal from online shopping I will do so but do not need to travel around, e.g. iherbs. I will take note of any sales e.g. diapers at ntuc, kiddy palace yearly 20%, spring maternity and etc. Personally I do not like to go to baby fair as it is very crowded and long queue. For large baby items e.g. cot and stroller, I will at least visit showroom to decide which one is suitable for me and baby.
The most important one would actually be the baby cot which I bought in 3rd trimester. Other miscellaneous living necessities also during the same time. As for stroller, or carrier I think that can wait. Some babies don't like being in strollers or carriers. So you could actually bring your baby for a trial run before you commit as those can be considered big ticket items.
I bought baby clothes only after I found out the gender together with the baby cot. As for stroller and carrier, I only bought those after my confinement and the baby gets to test it before purchasing.
I bought most of my items preloved, most in my second trimester. I bought my stroller, bath tubs and other knick knacks at the baby fair when I was about 8 months pregnant.
Avoid certain brand of stroller https://www.businessinsider.sg/singapore-issues-warning-on-11-unsafe-baby-products-including-baby-carriers-cots-and-strollers-sold-online/
stroller, walker and carrier, i bought it when my baby 6months old.
thanks
Liy