The pattern has these disclaimers "Not intended for babies under 4 months of age," "carrier...is one size, up to 35lbs," and "By purchasing this [product] you acknowledge that [the manufacturer] accepts no responsibility for injury due to use of this product." These disclaimers make sense given that when used this product does hold very precious cargo. I've had no problems using it. They also issue these safety precautions (you can't buy anything for children anymore that don't have safety precautions):
1. Check carrier each time for wear and tear before placing baby in carrier.
2. Always keep hands on a squirming baby.
3. Please keep child's airway free.
4. Remove baby from carrier before placing baby in car seat, crib or bed.
To these precautions, I also recommend that you keep one hand on your child while bending over.