2 months!

2 months
Mastered Skills (most kids can do)
• Vocalizes sounds — gurgling and cooing
• Follows objects
• Holds head up for short periods

Emerging Skills (half of kids can do)
• Smiles, laughs
• Holds head at 45-degree angle
• Movements become smoother

Advanced Skills (a few kids can do)
• Holds head steady
• Bears weight on legs
• May lift head and shoulder (mini-pushup)