Flying Crane Milk Powder is a well-known brand of infant milk powder in China, with several series of products. Each series has its own unique characteristics and applicability, so it's hard to say which series is the best. The following is a brief introduction to several major series of Feihe milk powder:

1. Feihe Gold Series: This is one of Feihe's most classic series, which is suitable for infants and young children aged 0-3 years old. The Gold Series is made from high quality milk and added with a variety of nutrients, such as DHA, ARA, and prebiotics, which help the baby's brain and eyesight development, and enhance immunity.

2. Feihe Starry Night Series: This series is suitable for newborns aged 0-6 months. The Stargain series uses a special formula with ingredients such as probiotics and nucleotides to help babies develop their digestive system and build up their immune system.

3. Feihe Zhi Fu series: This series is for toddlers aged 1-3 years old. Focusing on the baby's intellectual development, the Zhi Fu series adds a variety of brain nutrients, such as DHA, ARA and folic acid, which help the baby's cognitive ability and memory development.

4. Feihe Goat Milk Powder Series: This series is suitable for infants and toddlers aged 0-3 years old. Goat milk powder is easier to digest and absorb compared to cow milk powder and is suitable for babies who are allergic to cow milk or have indigestion. Feihe Goat Milk Powder is made from high quality goat milk source with a variety of added nutrients such as protein, fat and vitamins.

Overall, which series of Feihe milk powder to choose depends on your baby's age, health condition and individual needs. It is advisable to consult a doctor or professional before choosing one to ensure that you choose the most suitable formula for your baby. In addition, no matter which series of Feihe milk powder you choose, you should pay attention to the correct feeding method and storage method to ensure your baby's health and safety.