Within a very short time both Rama and Krsna began to walk very easily in Gokula on Their legs, by Their own strength, without the need to crawl - SB 10.8.26

Expressions researched:
"within a very short time both Rama and Krsna began to walk very easily in Gokula on Their legs, by Their own strength, without the need to crawl"

SB Canto 10.1 to 10.13

Within a very short time both Rāma and Kṛṣṇa began to walk very easily in Gokula on Their legs, by Their own strength, without the need to crawl.

SB 10.8.26, Translation and Purport:

O King Parīkṣit, within a very short time both Rāma and Kṛṣṇa began to walk very easily in Gokula on Their legs, by Their own strength, without the need to crawl.

Instead of crawling with Their knees, the babies could now stand up by holding on to something and walk little by little, without difficulty, by the strength of Their legs.